A Novel Dominant Allele from 93-11, ES(4), Represses Reactive Oxygen Species Scavenging and Leads to Early-Senescence in Rice

Senescence is the last developmental process in plant,which has an important impact on crop yield and quality.In this study,a stable hereditary early-senescence line BC64 was isolated from the high-generation recombinant inbred lines of 93-11 and Wuyunjing7(W7).Genetic analysis showed that the premature aging phenotype was controlled by a dominant gene derived from 93-11.By linkage analysis,the gene was primarily mapped in the region between marker B4 and B5 near the centromere of chromosome 4,described as ES(4).Through multiple backcrossing with W7,the near-isogenic line of ES(4)(NIL-ES(4))was obtained.Compared with wild-type W7,NIL-ES(4)plants showed more sever senescence phenotype in both nature and dark conditions.In NIL plants,leaves turned yellow at the fully tillering stage;photosynthetic rate,pollen fertility and seed setting rate were decreased.Moreover,the malondialdehyde,proline content and relative conductivity in NIL-ES(4)were significantly higher than those in W7;both transcript level and activities of reactive oxygen species scavenging enzymes were repressed;H2O2 and O^(2−)were significantly accumulated.This study provides a basis for further cloning and function identification of ES(4).

Possible Synergistic Toxicity of Oxygen Scavenger and Defoamer on the Niger Delta Freshwater <i>Tilapia guineensis</i>

Globally, the generation of produced water keeps increasing due to depleting wells and about 40% of this wastewater is disposed of into the environment. Produced water is made up of several components that are toxic in nature, like production chemicals that are used for oil and gas production activities. Oxygen scavenger and defoamer are commonly used for corrosion prevention as both are applied at different stages of corrosion prevention. Evaluation of the possible synergistic toxicity contribution of oxygen scavenger and defoamer formed the basis of this research and was conducted using the Tilapia guineensis as bio-indicator. The toxicity test was carried out using the ELIMINOX (oxygen scavenger) and EC9017A (defoamer) individually and both chemicals were combined together. The choice of these chemicals was premised on previous researches that have confirmed that they are toxic individually, without further research on how they interact when they are combined. These chemicals and freshwater were used to generate produced water samples in the laboratory. The experiment was set up by adding ten fishes into each of the glass containers, containing the produced water samples at different concentrations and a control sample without the chemicals. The rate of mortality of the fish for the individual chemicals ranged from 100% to 10% for the different percentage concentrations. While on the other hand, a combination of the two chemicals had more survival than mortality, the percentage survival rate ranged from 100% to 90% across all the percentage concentrations. The lethal concentration also showed that the oxygen scavenger was more toxic than the defoamer, however, when they were combined;they showed an antagonistic relationship as the toxicity of the oxygen scavenger drastically reduced. The research findings intend to create awareness of the possible interaction of production chemicals when they are used for oil and gas activities and their combined toxicity contribution to produced water. This will in turn aid government regulators in their decision-making for disposal of produced water.

Effect of Cd, Pb Stress on the Activated Oxygen Scavenging System in Tobacco Leaves

The effect of Cd, Pb stress on the activated oxygen scavenging system indicates thatthe content of chlorophyll, chlorophyll a/b ratio and the activity of CAT gradually decrease,the activity of SOD increases first and then decreases, and the activity of POD gradually increases with increasing concentrations of Cd and Ph. Between Cd and Ph there is synergism inthe activated oxygen scavenging system. The results show that the stress of Cd and Pb can affect the scavenging system of activated oxygen and result in imbalance of activated oxygenmetabolism.

Oxygen Scavenging Effect of LaLuO_3/TiN Gate Stack in High-Mobility Si/SiGe/SOI Quantum-Well Transistors

Higher-s dielectric LaLuO3, deposited by molecular beam deposition, with TiN as gate stack is integrated into high-mobility Si/SiGe/SOI quantum-well p-type metal-oxide-semiconduetor field effect transistors. Threshold voltage shift and capacitance equivalent thickness shrink are observed, resulting from oxygen scavenging effect in LaLuO3 with ti-rich TiN after high temperature annealing. The mechanism of oxygen scavenging and its potential for resistive memory applications are analyzed and discussed.

Effects of Different Cadmium Levels on Active Oxygen Metabolism and H_2O_2-Scavenging System in Brassica campestris L.ssp.chinensis

The effects of different Cd (Cadmium) levels on generation of active oxygen speceies(AOS) and H2O2-scavenging system in the leaves of Brassica campestris L. ssp. chinensiswere studied. The results showed that generation rate, and H2O2 content were enhancedand malondialdehyde (MDA) content increased with the increase of Cd concentrations inthe growth medium. The activities of ascorbate peroxidase (APX), dehydroascorbatereductase (DR) and glutathione reductase (GR) were promoted by the addition of Cd.Exposed to Cd also increased the contents of ascorbate (AsA) and glutathione (GSH) in theleaves.

Evaluation of Reactive Oxygen Species (ROS) Generated on the Surface of Copper Using Chemiluminesence

The antibacterial activity of copper is well-known from an ancient civilization, however, its biocidal mechanism has not been necessarily elucidated. Notwithstanding up to now, mainly 4 processes have been proposed. Among them, it is cleared that 4 kinds of reactive oxygen species (ROS): hydroxyl radical ·OH, hydrogen per oxide H2O2, superoxide anion ·O-2 and singlet oxygen 1O2, play an important role for contact-killing of bacteria, viruses and fungi. In this paper, generation of ROS on the surfaces of copper plates heated from room temperature to 673 K for 4.2 × 102 s in air, was investigated using the chemiluminescence. ROS have been evaluated by selecting the most suitable scavengers, such as 2-propanol for ·OH, sodium pyruvate for H2O2, nitro blue tetrazolium for ·O-2, and sodium azide NaN3 for 1O2. At the same time the outermost surface of copper, on which thin film of cuprous oxide Cu2O was first formed and then cupric oxide CuO was laminated on Cu2O, was examined by thin-film XRD and TEM analysis to estimate the amounts and kinds of copper oxides. It was found that the most amounts of ROS were obtained for the 573 K-heated Cu plate and they were composed of ·OH, H2O2, and ·O-2..

Protective Effects of Tea Polyphenol on Cerebral Ischemia-Reperfusion Injury in Rats and Its Scavenging Oxy-radical and Anticerebral Lipid Peroxidation Effects

AIM To study the protective effects of tea polyphenol (TP) on cerebral ischemia reperfusion injury in rats and its scavenging oxygen free radical(OFR) activities and antilipid peroxidation in vitro . METHODS Cerebral ischemia reperfusion injury was produced by bilateral ligation of the common carotid arteries with vagus nerves and reperfusion for 45 min. The mitochondrial lipid peroxidation of rat brain induced by oxygen free radical was measured by thiobarbituric acid spectrophotometry. Superoxide anion (O 2) from xanthine xanthine oxidase system and hydroxyl radical (·OH) from Fe 2+ -H 2O 2 system were determined with spectrophotometry. RESULTS During Cerebral ischemia reperfusion,TP improved the activities of superoxide dismutase ( P 【0 05), GSH peroxidase( P 【0 01) and catalase( P 【0 01), while decreasing the maiondialdchyde content in the brain( P 【0 05) and brain water content ( P 【0 01). Tea polyphenol possessed significantly scavenging effects on ·OH produced by Fenton reaction and O 2 produced by xanthine xanthine oxidase system (the IC 50 were 2 2 mmol·L -1 and 1 9 mmol·L -1 respectively). Tea polyphenol could significant inhibit the lipid peroxidation of cerbral mitochondrial membrane induced by ·OH in a concentration dependent manner. CONCLUSION The results indicate that tea polyphenol could protect the injury on cerebral ischemia reperfusion in rats for OFR, these effects may be related to its scavenging effects on oxygen free radicals and antilipid peroxidant.

水杨酸调控活性氧稳态维持马铃薯愈伤早期的细胞膜完整性

本研究用2 mmol/L水杨酸(salicylic acid,SA)溶液浸泡处理人工损伤的马铃薯块茎10 min,测定愈伤早期(损伤后12 h内)块茎伤口处的活性氧(reactive oxygen species,ROS)产生量及酶促清除系统相关酶活性,分析体外抗氧化能力以及细胞膜的完整性。结果表明,SA提高了愈伤早期块茎伤口处NADPH氧化酶和超氧化物歧化酶活性,促进了伤口处O_(2)^(―)·和H_(2)O_(2)的积累。SA总体提高了块茎伤口处过氧化物酶活性,但总体降低了过氧化氢酶活性。SA还提高了抗坏血酸过氧化物酶、脱氢抗坏血酸还原酶、单脱氢抗坏血酸还原酶和谷胱甘肽还原酶活性,以及抗坏血酸和还原型谷胱甘肽的水平。此外,SA提高了块茎伤口处的1,1-二苯基-2-三硝基苯肼自由基、2,2’-联氮双(3-乙基苯并噻唑啉-6-磺酸)阳离子自由基清除能力以及铁离子还原能力,降低了细胞膜渗透率和丙二醛含量。综上,SA可以通过调控马铃薯块茎愈伤早期伤口处的ROS稳态,提高体外抗氧化能力从而维持细胞膜的完整性,保证愈伤早期正常代谢的顺利进行。

BC-DE乙烯脱氧剂工业侧线试验

按照小试制备的工艺条件放大生产了500kg BC-DE脱氧剂,并将其用于脱除乙烯中的微量氧杂质;在12L的工业侧线装置上,考察了BC-DE脱氧剂在室温(-5～40℃)和100℃条件下的脱氧情况及使用周期。BC-DE脱氧剂使用前经体积组成1%H2-99%N2的混合气在150℃下还原24h。在2.6MPa、1 500h-1的条件下,室温和100℃下净化后的乙烯中氧含量(体积分数)分别为4.6×10-8和1.5×10-8;室温下BC-DE脱氧剂将乙烯中的氧含量从(0.5～2.0)×10-6净化至小于1.0×10-7的使用周期是13个月,提高反应温度至100℃后还可继续使用4个月;100℃下净化后的乙烯中没有其他副产物生成。与现有的乙烯脱氧温度100℃相比,200kt/a聚乙烯装置在室温(25℃)下脱氧每年可节约能量3.1×1010kJ。

Integrated high-performance and accurate shaping technology of low-cost powder metallurgy titanium alloys: A comprehensive review

The practical engineering applications of powder metallurgy (PM) Ti alloys produced through cold compaction and pressure-less sintering are impeded by poor sintering densification, embrittlement caused by excessive O impurities, and severe sintering deforma-tion resulting from the use of heterogeneous powder mixtures. This review presents a summary of our previous work on addressing the above challenges. Initially, we proposed a novel strategy using reaction-induced liquid phases to enhance sintering densification. Near- complete density (relative density exceeding 99%) was achieved by applying the above strategy and newly developed sintering aids. By focusing on the O-induced embrittlement issue, we determined the onset dissolution temperature of oxide films in the Ti matrix. On the basis of this finding, we established a design criterion for effective O scavengers that require reaction with oxide films before their dissol-ution. Consequently, a ductile PM Ti alloy was successfully obtained by introducing 0.3wt% NdB6 as the O scavenger. Lastly, a powder- coating strategy was adopted to address the sintering deformation issue. The ultrafine size and shell-like distribution characteristics of coating particles ensured rapid dissolution and homogeneity in the Ti matrix, thereby facilitating linear shrinkage during sintering. As a result, geometrically complex Ti alloy parts with high dimensional accuracy were fabricated by using the coated powder. Our fundament-al findings and related technical achievements enabled the development of an integrated production technology for the high-performance and accurate shaping of low-cost PM Ti alloys. Additionally, the primary engineering applications and progress in the industrialization practice of our developed technology are introduced in this review.

Diamond-Like Carbon Depositing on the Surface of Polylactide Membrane for Prevention of Adhesion Formation During Tendon Repair

Post-traumatic peritendinous adhesion presents a significant challenge in clinical medicine.This study proposes the use of diamond-like carbon(DLC)deposited on polylactic acid(PLA)membranes as a biophysical mechanism for anti-adhesion barrier to encase ruptured tendons in tendon-injured rats.The results indicate that PLA/DLC composite membrane exhibits more efficient anti-adhesion effect than PLA membrane,with histological score decreasing from 3.12±0.27 to 2.20±0.22 and anti-adhesion effectiveness increasing from 21.61%to 44.72%.Mechanistically,the abundant C=O bond functional groups on the surface of DLC can reduce reactive oxygen species level effectively;thus,the phosphorylation of NF-κB and M1 polarization of macrophages are inhibited.Consequently,excessive inflammatory response augmented by M1 macrophage-originated cytokines including interleukin-6(IL-6),interleukin-1β(IL-1β),and tumor necrosis factor-α(TNF-α)is largely reduced.For biocompatibility evaluation,PLA/DLC membrane is slowly absorbed within tissue and displays prolonged barrier effects compared to traditional PLA membranes.Further studies show the DLC depositing decelerates the release of degradation product lactic acid and its induction of macrophage M2 polarization by interfering esterase and PLA ester bonds,which further delays the fibrosis process.It was found that the PLA/DLC membrane possess an efficient biophysical mechanism for treatment of peritendinous adhesion.

DFT Study on Molecular Structures and ROS Scavenging Mechanisms of Novel Antioxidants from Lespedeza Virgata

The molecular structure and radical scavenging activity of three novel antioxidants from Lespedeza Virgata, lespedezavirgatol, lespedezavirgatal, and lespedezacoumestan, have been studied using density functional theory with the B3LYP and BhandHLYP methods. The optimized geometries of neutral, radical cation, radical and anion forms were obtained at the B3LYP/6-31G（d） level, in which it was found that all the most stable conformations contain intramolecular hydrogen bonds. The same results were obtained from the MP2 method. The homolytic O-H bond dissociation enthalpy and the adiabatic ionization potential of neutral and anion forms for the three new antioxidants and adiabatic electron affinity and H-atom affinity for hydroxyl radical, superoxide anion radical, and hydrogen peroxide radical were determined both in gas phase and in aqueous solution using IEF-PCM and CPCM model with UAHF or Bondi cavity. The antioxidant activities and reactive oxygen species scavenging mechanisms were then discussed, and the results obtained from different methods are consistent. Furthermore, the antioxidant activities are consistent with the experimental findings of the compounds under investigation.

Studies on Biologically Active Principles of Huangqi,Root of Astragalus membranaceous,Isolation and Detection of Constituents Scavenging Superoxide Anion

本文使用黄嘌呤-黄嘌呤氧化酶—鲁米诺化学发光体系和化学发光检测法研究了黄芪中各成分的清除超氧阴离子自由基的能力,以药物抑制发光强度50%的浓度(IC_(50))为指标。经研究证明,黄芪总皂甙部分(N)具有较强的活性,IC_(50)为185μg/ml,再经进一步导向分离并鉴定证明,黄芪甙Ⅲ,Ⅳ和Ⅵ的 IC)_(50)分别为80、50和11μg/ml,从而证明黄芪的抗心力衰竭的有效成分可能为黄芪总皂甙部分。

TaNF-YB11,a gene of NF-Y transcription factor family in Triticum aestivum,confers drought tolerance on plants via modulating osmolyte accumulation and reactive oxygen species homeostasis

Transcription factors(TFs)regulate diverse stress defensive-associated physiological processes and plant stress responses.We characterized TaNF-YB11,a gene of the NF-YB TF family in Triticum aestivum,in mediating plant drought tolerance.TaNF-YB11 harbors the conserved domains specified by its NF-YB partners and targets the nucleus after the endoplasmic reticulum(ER)assortment.Yeast two-hybrid assay indicated the interactions of TaNF-YB11 with TaNF-YA2 and TaNF-YC3,two proteins encoded by genes in the NF-YA and NF-YC families,respectively.These results suggested that the heterotrimer established among them further regulated downstream genes at the transcriptional level.The transcripts of TaNF-YB11 were promoted in roots and leaves under a 27-h drought regime.Moreover,its upregulated expression levels under drought were gradually restored following a recovery treatment,suggesting its involvement in plant drought response.TaNF-YB11 conferred improved drought tolerance on plants;the lines overexpressing target gene displayed improved phenotype and biomass compared with wild type(WT)under drought treatments due to enhancement of stomata closing,osmolyte accumulation,and cellular reactive oxygen species(ROS)homeostasis.Knockdown expression of TaP5CS2,a P5CS family gene modulating proline biosynthesis that showed upregulated expression in drought-challenged TaNF-YB11 lines,alleviated proline accumulation of plants treated by drought.Likewise,TaSOD2 and TaCAT3,two genes encoding superoxide dismutase(SOD)and catalase(CAT)that were upregulated underlying TaNF-YB11 regulation,played critical roles in ROS homeostasis via regulating SOD and CAT activities.RNA-seq analysis revealed that numerous genes associated with processes of‘cellular processes',‘environmental information processing',‘genetic information processing',‘metabolism',and‘organismal systems'modified transcription under drought underlying control of TaNF-YB11.These results suggested that the TaNF-YB11-mediated drought response is possibly accomplished through the target gene in modifying gene transcription at the global level,which modulates complicated biological processes related to drought response.TaNF-YB11 is essential in plant drought adaptation and a valuable target for molecular breeding of drought-tolerant cultivars in T.aestivum.

Co-oxidation of arsenic(Ⅲ) and iron(Ⅱ) ions by pressurized oxygen in acidic solutions

The co-oxidation of As(Ⅲ) and Fe(Ⅱ) in acidic solutions by pressured oxygen was studied under an oxygen pressure between 0.5 and 2.0 MPa at a temperature of 150℃. It was confirmed that without Fe(Ⅱ) ions, As(Ⅲ) ions in the solutions are virtually non-oxidizable by pressured oxygen even at a temperature as high as 200℃ and an oxygen pressure up to 2.0 MPa. Fe(Ⅱ) ions in the solutions did have a catalysis effect on the oxidation of As(Ⅲ), possibly attributable to the production of such strong oxidants as hydroxyl free radicals (OH ) and Fe(Ⅳ) in the oxidation process of Fe(Ⅱ). The effects of such factors as the initial molar ratio of Fe(Ⅱ)/As(Ⅲ), initial pH value of the solution, oxygen pressure, and the addition of radical scavengers on the oxidation efficiencies of As(Ⅲ) and Fe(Ⅱ) were studied. It was found that the oxidation of As(Ⅲ) was limited in the co-oxidation process due to the accumulation of the As(Ⅲ) oxidation product, As(Ⅴ), in the solutions.

不同强度光强胁迫对海带(Saccharina japonica)幼苗光合生理的影响

海带(Saccharinajaponica)是我国藻类生产的主要品种之一,其栽培面积和产量均居世界首位。2021~2022年产季,山东荣成海带主产区先后暴发了大规模病烂灾害,给当地水产经济造成了巨大损失。引起病烂的原因可能来自多方面,其中藻体所受光照过强及水体营养盐水平较低可能起到了一定作用,为此,基于海带幼苗的最小饱和光强、烟台高新区牟平自然海区海水氮磷浓度及不同海水深度下的光照强度测定结果,研究了梯度强光在不同海水营养盐水平下对海带生理的影响,以期为“烂菜”现象的病因分析提供一定的线索。结果显示,海带幼苗在700~900μE/(m^(2) s)强光胁迫3 d后, Fv/Fm可恢复至对照水平,光合色素合成活跃,营养盐含量较高的海水更有助于PSII的修复,但1 300~1 500μE/(m^(2) s)的强光辐射导致PSII不能恢复,岩藻黄素、叶绿素a及β-胡萝卜素含量显著降低。整个胁迫实验中,藻体总抗氧化能力(T-AOC)及其他抗氧化酶比活力大体上在强光胁迫的起始至第3天上调,而在胁迫第5天时又出现下降趋势,且在营养盐含量较高的处理组中,各样本活性均高于天然海水处理组样本。抗氧化酶基因的表达也呈现类似的变化趋势。在低于900μE/(m^(2) s)的光照条件下,抗氧化酶活性可以得到较好的维持,而海水中相对较为丰富的营养盐则有利于藻体抗氧化能力的维持。研究结果为荣成海带病烂暴发的原因分析提供了一定的借鉴。

延长油田某注水站清水回注处理实验研究

为了达到水质考核标准,针对延长油田某注水站滤后悬浮物固体含量、细菌含量超标等水质不达标的问题,通过开展室内实验,运用绝迹稀释法、静态挂片法、浊度分析法、正交试验法和极差分析法,优选了药剂种类和投加浓度,研究了加药时间间隔和加药次序对絮凝效果的影响,评价了药剂之间的配伍性,确定出适合该站的水处理药剂配方。室内实验结果表明:当pH值为7.5时,絮凝剂加量为100 mg/L,助凝剂加量为60 mg/L,间隔时间超过1 min,杀菌剂加量为20 mg/L,除氧剂加量为130 mg/L。处理后的水悬浮物含量降为4.2 mg/L,粒径中值为2.8μm,细菌降为2.5 mg/L,达到油田注入水标准。按照以上筛选出的各种水处理剂选型及浓度选择混合后,配伍性良好。该研究成果可为该站下一步水处理工艺的优化以及水处理药剂管理提供理论基础。

纸片型1-MCP处理对‘朝霞’水蜜桃果实活性氧清除系统的影响

目的研究纸片型1-甲基环丙烯(1-methylcyclopropene,1-MCP)处理对‘朝霞’水蜜桃果实活性氧(reactive oxygen species,ROS)清除系统的影响。方法用1.2μL/L纸片型1-MCP处理‘朝霞’水蜜桃12 h,以没有1-MCP处理的‘朝霞’水蜜桃为对照,果实在(25±1)℃下贮藏12d,每隔2d取样分析果实超氧阴离子自由基(O_(2)^(-)·)产生速率、丙二醛(malondialdehyde,MDA)含量、内源抗氧化物质含量和ROS清除酶活性的变化。结果与对照‘朝霞’水蜜桃比较,1-MCP处理的‘朝霞’水蜜桃显现出较低的O_(2)^(-)·产生速率和MDA含量,较高的还原型谷胱甘肽和抗坏血酸含量,以及较高的过氧化氢酶、超氧化物歧化酶和抗坏血酸过氧化物酶活性。结论纸片型1-MCP处理能增强‘朝霞’水蜜桃ROS清除能力,有效减少其果实ROS的产生与MDA的积累,减轻‘朝霞’水蜜桃膜脂过氧化,维持细胞膜结构的完整性,从而保持‘朝霞’水蜜桃果实采后品质、增强其耐贮性。

菜心耐盐品种的筛选及其耐盐机理

耐盐品种选育是改善次生盐渍化导致的菜心减产的措施之一,因此,对菜心耐盐品种进行筛选并明确其耐性机理。在对照及盐处理条件下,通过测定9个菜心品种的生长指标,初步比较品种间的耐盐性差异,并筛选出耐盐品种及敏盐品种。同时,比较在盐胁迫条件下耐盐品种及敏盐品种的光合特性、MDA含量、相对电导率、组织化学染色、SOD、POD、CAT、APX活性、根系活力、地上部及地下部硝酸盐含量及硝酸还原酶活性,初步阐明菜心的耐盐机理。对供试9个品种菜心的生长指标进行分析,筛选出耐盐品种连州F_(1)及盐敏感品种金秋红二号红;与对照(15 mmol/L Ca(NO_(3)_(2))处理相比,在80 mmol/L Ca(NO_(3)_(2)胁迫下连州F_(1)的叶绿素含量、净光合速率、气孔导度、蒸腾速率的下降程度明显低于品种金秋红二号红;连州F_(1)的相对电导率、MDA含量、O_(2)^(-)·、H_(2)O_(2)的含量在Ca(NO_(3)_(2)胁迫下增加的程度低于品种金秋红二号红,而氧自由基的清除则成相反趋势;同时,80 mmol/L Ca(NO_(3)_(2)胁迫下连州F_(1)的地上及地下部分硝酸盐含量低于金秋红二号红,而硝酸还原酶的活性更高;连州F_(1)的根系活力受硝酸盐影响的程度低于金秋红二号红。连州F_(1)为耐盐型菜心品种,金秋红二号红为盐敏感型菜心品种,连州F_(1)所受的氧化胁迫程度较低,并且具有较高的光合效率和硝酸盐的还原能力,能够使其在硝酸盐胁迫下具有较好的生长能力,因此,在盐渍化程度较高的土地上,优先推荐连州F1作为主要栽培品种。

联氨对蒸汽发生器湿保养效果的影响机制研究

采用氧含量测试、腐蚀形貌观察和电化学法,在模拟压水堆核电站蒸汽发生器湿保养水化学工况下,开展联氨的除氧效果对比和对典型金属材料的腐蚀风险评估。联氨的除氧效果在低浓度下(<75mg/kg)无明显差异,在150mg/kg时略有提升。试片在低浓度(≤50mg/kg)联氨溶液浸泡后表面有大量球状腐蚀产物堆积,联氨浓度提高至75mg/kg时,试片表面腐蚀产物显著减少。联氨通过在金属表面吸附并形成钝化膜,阻碍氧化还原反应的电荷转移过程,增大金属在溶液中发生电化学腐蚀的动力学阻力,从而降低腐蚀。随着联氨浓度增加,所形成的钝化膜均匀性增强,膜层厚度增大。