Enhanced corrosion resistance of epoxy resin coating via addition of CeO_(2) and benzotriazole

The use of fillers to enhance the corrosion protection of epoxy resins has been widely applied.In this work,cerium dioxide(CeO_(2))and benzotriazole(BTA)were introduced into an epoxy resin to enhance the corrosion resistance of Q235 carbon steel.Scanning electron microscopy results indicated that the CeO_(2) grains were rod-like and ellipsoidal in shape,and the distribution pattern of BTA was analyzed by energy dispersive spectroscope.The dynamic potential polarization curve proved the excellent corrosion resistance of the composite epoxy resin with CeO_(2) and BTA co-addition,and electrochemical impedance spectroscopy test analysis indicated the significantly enhanced long-term corrosion protection performance of the composite coating.And the optimal protective performance was provided by the coating containing 0.3%(mass)CeO_(2) and 20%(mass)BTA,which was attributed to the barrier performance of CeO_(2) particles and the chemical barrier effect of BTA.The formation of corrosion products was analyzed using X-ray diffraction.In addition,the corrosion resistance mechanism of the coating was also discussed in detail.

Comparison of Lubricities of Two Novel Benzotriazole Derivatives Used as Additives in Water-Glycol Hydraulic Fluid

Two kinds of benzotriazole derivatives with and without sulfur(abbreviated as BSC and BC, respectively,) were synthesized and their lubricating, anticorrosion and antirust properties were investigated, when they were used as additives in the water-glycol fluid. The morphology and chemical species of typical elements on the worn surface were examined by the scanning electron microscopy(SEM), the energy dispersive spectrometry(EDS), and the X-ray photoelectron spectroscopy(XPS) in order to reveal the tribological mechanisms. The results indicated that two synthesized additives could effectively improve the anti-wear, friction-reducing, load-carrying, anticorrosion, and antirust properties of the base fluid. The surface analysis illustrated that stable nitrogen-containing absorption films generated by BC should be responsible for its facilitated anti-wear and friction-reducing performance, and the excellent lubricities of BSC should be attributed to the combined action of adsorption film and tribo-chemical film which were composed of iron oxides, iron sulfides and iron sulfates. The superior lubricating properties of BSC as compared to that of BC demonstrated the effectiveness of elemental sulfur in reducing friction and wear, especially under high loads. But corrosion wear is more obvious at a relative high concentration of elemental sulfur.

Interactions between benzotriazole and corncob biochars pyrolyzed at different temperature

The sorption of ionizable benzotriazole(BTA) to corncob biochars pyrolyzed at different temperature(i.e., 300oC, 500oC and 800oC) was investigated in this study. Biochars produced at higher temperature showed higher surface area, micropore volume and aromaticity. Consequently, the sorption of BTA changed from absorption to adsorption for biochars pyrolyzed at 300 oC and 800 oC, respectively. Solution p H affected speciation of BTA and surface charge properties of biochars. For BTA^0, H-bond, partition and micropore filling are dominant sorption mechanisms. For BTA-, it is suggested that negative charge-assisted H-bond plays an important role in sorption. Corncob biochar pyrolyzed at high temperature(e.g., 800 oC) showed the highest sorption affinity for BTA. Ca^(2+) in solution enhanced BTA^- and BTA^0 sorption through cation-bridge and surface complexation.

Synthesis, Electrocatalytic Properties and Crystal Structure of a New Organic-inorganic Hybrid Constructed from Dodecamolybdophosphoric Acid and Benzotriazole

A new compound, (C 6H 6N 3) 7(PMo Ⅵ 12 O 40 )(PMo ⅤMo Ⅵ 11 O 40 )·2CH 3CH 2OH·5H 2O, was synthesized and characterized by means of elemental analyses, IR spectroscopy, 1H NMR spectroscopy and single crystal \{X ray\} diffraction. This is the first example of benzotriazole polyoxometalates species. The compound crystallized in a triclinic space group P 1 with a =1 8378(4) nm, b =1 9078(4) nm, c =2 1037 (4) nm, α =\{63 41(3)°\}, β =64 31(3)°, γ =68 38(3)°, V =5 803(2) nm 3, Z =2, R 1=0 0486, wR 2=0 1357. The X ray crystallographic study showed that the crystal structure was constructed by electrostatic interactions and hydrogen bonds between dodecamolybdophosphorate anions and protonated benzotriazole cations. The electrochemical behavior and the reduction of nitrite and hydrogen peroxide electrocatalyzed by the title compound were studied.

Corrosion resistance of benzotriazole passivated Cu-Zn-Alshape memory alloy in artificial Ringer's solution

The corrosion resistance of the Cu-Zn-Al shape memory alloy passivated by benzotriazole was investigated by salt spraying test and electrochemical methods in artificial Ringer＇s solution. The results showed that after benzotriazole passivation, the corrosion resistance of the Cu-Zn-Al shape memory alloy was improved evidently. The anodic polarization current density of the passivated alloy decreased, the mass loss reduced, the anodic passivation accelerated, the anodic active dissolution was inhibited effectively, and the surface tarnishing was reswained. Infrared reflection spectrum test showed that Cu（Ⅰ）-benzotriazole or Cu（Ⅱ）-benzotriazole complex layer was formed on the surface of the Cu-Zn-Al shape memory alloy after passivation. This layer appeared plane, well adhesion, and presented homogeneous golden metallic luster. The corrosion resistance of the Cu-Zn-Al shape memory alloy passivated by benzotriazole is improved for the formation of an electrochemical stable baffle layer on passivated surface. This layer separates the metal substrate from the outside corrosion medium effectively and retards the corrosion process of dezincification.

α-Fe_(2)O_(3)/Cu_(2)O composites as catalysts for photoelectrocatalytic degradation of benzotriazoles

Given the difficulties of degrading benzotriazole(BTA),this study used a one-pot hydrothermal method to prepareα-Fe_(2)O_(3)/Cu_(2)O(FC)composites for photoelectrocatalytic(PEC)degradation of BTA.The characterization of FC structure showed that Cu_(2)O in cubic crystals was loaded with circular sheets of Fe_(2)O_(3).Owing to this structure,FC showed efficient PEC degradation of BTA when exposed to ultraviolet light.The experimental results demonstrated that FC efficiently degraded BTA.When the PEC degradation continued for 60 min,100%degradation of BTA was achieved because FC enhanced the photoelectron-hole separation and the separation and transfer of articulated carriers.High per-formance liquid chromatography-mass spectrometry showed that intermediates formed during the PEC degradation of BTA.Finally,various pathways for degradation of BTA were postulated.This FC-based PEC system provides a harmless and effective method for degradation of BTA.

COORDINATION POLYMERIZATION OF BENZOTRIAZOLE ON THE SURFACE OF METALLIC COPPER

The coordination polymerization of benzotriazole with metallic copper has been investigated by infrared and X-ray photoelectron spectroscopies. We found that benzotriazole could react with copper (0) under mild conditions to form bis (benzotriazolato) copper (Ⅱ) and benzotriazolato copper (Ⅰ)which covered the surface of copper metal in the shape of polymeric materials. Since benzotriazole is of great interest as a ligand in that its presence in many biological system with metal ions, and is considered as a corrosion inhibitor, this work will be in favour of the study of protective corrosion.

Syntheses and Biological Activities of Novel Benzotriazole Compounds Containing a Thioamide Group

（E） -2- （ 1H-Benzo [ d ] [ 1,2,3 ] trlazol-1-yl） -3- （4-chlorophenyl） -3 -hydroxy-N-phenylprop-2 -enethioamide （ compound 1 ） and （E） -2- （ 1H-benzo [ d ] [ 1,2,3 ] trlazol-1-yl ） -3 -hydroxy-N, 3 -diphenylprop-2-enethioamide （ compound 2） were synthesized and their structures were confirmed by means of IR, MS, ^1H NMR, and elemental analysis. The structure of compound 1 was determined with single-crystal X-ray diffraction analysis. The results of the biological test show that the two compounds have a certain antifungal activity.

Synergistic Effect of Tungstate and Benzotriazole on Corrosion Inhibition of Carbon Steel in Solutions Containing Cl^-

The corrosion inhibition of tungstate, benzotriazole (BTA) and their combination in solutions containing Cl- was studied by electrochemical techniques. The results indicated that the inhibition efficiency of tungstate was higher than that of BTA. The efficiency increased with increasing concentration of tungstate or BTA. In the studies of synergistic effect of tungstate and BTA, it had been found that in pH 9.0 solution, the largest R t could be obtained with the concentration ratio of tungstate / BTA being 1∶1. Lowering the pH value of solution would reduce the efficiency of inhibitors, especially in binary inhibitors. Increasing the concentration of Cl- accelerated the corrosion of carbon steel in the solutions with various inhibitors, but the influence of Cl- on corroding rate in binary inhibitors was not so strong as in single component. The results of surface analysis showed that W, C, N, O and Fe elements existed in the protecting film formed with binary inhibitors. The thickness of the film was about 1215 nm.

Synthesis of Aminomethyl Arylsulfides via Novel Synthetic Auxiliary Benzotriazole Promoted by Samarium Diiodide

Aminomethyl arylsulfides are synthesized through nucleophilic substitution of a benzotriazolate anion by thiolates promoted by samarium diiodide.

Investigation on the Morphology of Adsorbed Benzotriazole Film on Copper Surface by Scanning Tunneling Microcopy

It is observed by scanning tunneling microscopy (STM) that the adsorbed Benzotriazole (BTA) on copper is long in shape and has an irregular rectangle.The growth of BTA on copper is in the from of polymeric chain and mainly in one dimension rather than two dimensions.The copper surface covered by BTA becomes flatter,smoother and the roughness was smaller than that of bare copper,so the corrosion is largely decreased.However,many grooves can be seen between BTA polymeric chains in which corrosion may exist to a degrees.

N-(4-芳基-噻唑-2-基)-ω-(1H-苯并三唑-1-基)苯乙酮腙类衍生物的合成

以苯并三唑为原料与ω-溴代芳基乙酮缩合得ω-(1H-苯并三唑-1-基)芳基乙酮,再与硫代氨基脲缩合得到新的缩氨基硫脲.然后分别与5种ω-溴代芳基乙酮环化得到一系列新的含苯并三唑和噻唑环的苯乙酮腙类Schiff碱.其结构经IR,1HNMR,13CNMR和MS及元素分析确证.

Four New Cu(Ⅱ) Complexes with Benzotriazole-based Ligands: Syntheses, Crystal Structures and Theoretical Investigations

Four new Cu（Ⅱ） complexes with two benzotriazole-based ligands, [Cu2（L^1）2（NO3）2]· 2H2O （1）, [Cu2（L^1）2]·2ClO4·2H2O （2）, [Cu2（HL^2）2（NO3）4]·2CH3COCH3 （3） and [Cu（HL^2）2（Cl）]·Cl·2CH2Cl2 （4）, where HL^1 = 1,3-bis（benzotriazol-2-yl）-2-propanol and HL^2 = 1,3-bis（benzotriazol-1-yl）-2-propanol, were synthesized and structurally characterized by elemental analyses, IR and single-crystal X-ray diffraction analyses. It is revealed that complexes 1～3 have dinuclear structures, while 4 possesses a one-dimensional （1-D） chain structure, which extends in two orthogonal orientations. In 1～4, the coordination numbers of Cu（Ⅱ） centers range from four to six, which may be attributed to the different geometries and coordination abilities of the ligands and anions. The L^1 ligand in complexes 1 and 2 adopts a tridentate di-chelating coordination mode, whereas ligand HL^2 in complexes 3 and 4 has a bidentate bridging coordination mode. The different coordination modes of these two ligands may be explained by the different charges of nitrogen donor atoms in the benzotriazole ring, which has been investigated by density functional theory （DFT） calculations.

Facile and Stereoselective Synthesis of N-Substituted Benzotriazole with Baylis-Hillman Adducts

A convenient method has been developed toward the stereoselective synthesis of N-substituted benzotriazole derivatives under mild conditions. The good stereolectivity, high yields and the simple procedure make the present protocol attractive.

Synthesis of Ultraviolet Absorber Benzotriazole by Nanoparticles Ag/SiO_2 Catalytic Hydrogenation

The Ag/SiO2 nanoparticles had been successfully synthesized. The Ag/SiO2 nano- particles can be an excellent catalyst for the synthesis of ultraviolet absorber benzotriazole by catalytic hydrogenation. The synthesis route is very efficient with less pollution and excellent yields. It is also easy to industrialized production.

固相萃取-一标多测高效液相色谱法测定化妆品中5种苯并三唑类防晒剂

建立了固相萃取技术结合高效液相色谱测定化妆品中5种苯并三唑类防晒剂的一标多测定量分析方法。该方法待测样品使用HLB固相萃取小柱净化处理,以亚甲基双-苯并三唑基四甲基丁基酚为内参物,通过建立该物质与另外4种物质的相对校正因子,计算出各物质的含量。研究了不同进样量、不同流动相流速及不同柱温对相对校正因子的影响,比较了一标多测法和外标法的计算结果。结果表明,5种物质的线性关系良好(R^(2)≥0.9997),检测限和定量限分别为4.00~26.43μg/L和10.00~60.42μg/L;各物质的相对校正因子重复性较好,其相对标准偏差(RSD)为0.25%~1.16%;两种方法计算结果无明显差异,其相对平均偏差(RAD)为0.12%~2.19%。该方法操作简单,使用标准物质少,检测效率高,可用于化妆品中5种防晒剂的含量测定和质量控制。

SYNTHESIS OF ACYCLIC ANALOGS OF BENZOTRIAZOLE AND INDOLE NUCLEOSIDE CONTAINING PERFLUOROALKYL GROUP

1-[(2-hydroxyethoxy)methyl]benzotriazole and -indole containing perfluoroalkyl group have been synthesized.

基于木质素-有机黏土复合水凝胶的固相萃取-SERS联用技术用于变压器油中微量1,2,3-苯并三氮唑的现场分析

该文以脱碱木质素(DAL)和硅藻土(DE)为原料,通过加入2.5%丙烯酸(AA)、0.75%过硫酸铵(APS)和0.25%N’N-亚甲基双丙烯酰胺(MBA),基于自由基聚合法制备了DAL/DE水凝胶。利用高效液相色谱法考察了水凝胶对变压器油中1,2,3-苯并三氮唑(BTA)的吸附性能,随后使用表面增强拉曼散射(SERS)辅以固相萃取技术现场检测了变压器油中的BTA。研究结果表明,在0.6 g DAL/DE水凝胶为固相萃取填料,水为活化剂,BTA变压器油样稀释1倍,洗脱剂为1 mL乙酸的条件下,BTA在776 cm^(-1)处的峰强于1~500 mg/kg范围内与其含量呈良好的线性关系,检出限低至0.28 mg/kg。