循环水添加碳钢缓蚀剂应用经验

针对中水、化工行业工业废水应用，电厂循环冷却水系统碳钢管道出现的严重腐蚀问题，通过添加循环水系统专用碳钢缓蚀剂，并经过6年高浓缩倍率K=3.0～5.0倍的安全运行结果，可达到《GB50050-2007工业循环冷却水处理设计规范》规定的总Fe≤1.0 mg/L的要求。证明成功解决碳钢防腐蚀问题。

一种联噻唑胺作为硫酸溶液中碳钢缓蚀剂的研究

本文合成了【4，4’-联噻唑】-2，2’-二胺（TDA），并用IHNMR和质谱确定其结构。采用静态失重法、动电位极化曲线、电化学阻抗等方法研究了TDA在0．5M硫酸溶液中对碳钢的腐蚀抑制作用。用扫描电镜（SEM）表征了碳钢的腐蚀形貌，并通过量子化学计算验证了其缓蚀性能。结果表明，TDA是一种有效的酸性溶液中的碳钢缓蚀剂。在碳钢表面的吸附符合Langmuir吸附等温式，电化学结果表明是一种混合型缓蚀。

磷锌系控制某电厂循环水缓蚀阻垢性能研究

采用旋转挂片失重法,模拟电厂循环冷却水系统现场情况,进行缓蚀实验分析,优选出适合该电厂循环冷却水工况的缓蚀阻垢剂配方,同时通过实验的方法考证正磷酸盐、有机膦酸盐和锌盐分别缺失的情况下对碳钢的不同缓蚀效果。实验证明:有机磷酸盐、正磷酸盐、锌盐单独使用时即可取得一定的缓蚀效果,但彼此间复配,可以在较低的加药量情况下达到很好的缓蚀效果。

酸性介质中桂圆壳碳点对碳钢的缓蚀性能研究

为开发环境友好、高缓蚀效率的新型缓蚀剂,以桂圆壳生物质为碳源,通过煅烧法和水热法分别合成桂圆壳碳点 (longan shell-CDs,ls-CDs) 和氮掺杂桂圆壳碳点 (N-lsCDs)。在此基础上,本文通过 FT-IR、XPS、TEM、电化学方法、荧光光谱分析 (FL) 和静态失重法等手段对其光学性质、结构组成和缓蚀性能进行了测定分析。结果表明:在1 mol·L^(-1)HCl 体系中,当 ls-CDs 和 N-lsCDs 的浓度为 100 和 20 mg·L^(-1)时,对Q235钢的缓蚀效率分别达到89.49%和92.41%。尤其是N-lsCDs,具有投加量低、原料废物利用、缓蚀性能优异的特点。极化曲线测试表明N-lsCDs为混合型抑制剂,并且N-lsCDs在碳钢表面的吸附符合Langmuir吸附等温式,同时存在物理吸附与化学吸附。利用生物质为原料制备环保新型缓蚀剂能够变废为宝,具有诱人的潜在应用前景。

Veratraldehyde as Corrosion Inhibitor for Mild Steel in Different Acid Medium

Veratraldehyde was tested as a corrosion inhibitor for mild steel in I M HCI and 0.5 M H2SO4 separately using mass loss and electrochemical studies. The inhibition efficiencies were evaluated at different concentrations of the inhibitor at different temperatures. The inhibition efficiency increased with increase in inhibitor concentration and decreased with increase in temperature in both the acid solutions. Electrochemical studies showed that the inhibitor is of mixed type with a slight predominance of anodic character. The inhibitor was more active in HCI than in H2SO4. The maximum inhibition efficiency approached at 1000 ppm in both the acid medium. The inhibitor was found to adsorb on the mild steel surface according to the Langmuir adsorption isotherm. The surface morphology of mild steel in the presence and absence of inhibitor was studied by using scanning electron microscopic （SEM） images.

Adsorption isotherm and inhibition effect of a synthesized di-(m-Formylphenol)-1,2-cyclohexandiimine on corrosion of steel X52 in HCl solution

The potential of di-(m-Formylphenol)-1,2-cyclohexandiimine as an environmentally friendly corrosion inhibitor for steel was investigated in 1 mol/L HCl using potentiodynamic polarization, electrochemical impedance spectroscopy and chronoamperometry measurements. All electrochemical measurements suggest that this compound is an excellent corrosion inhibitor for mild steel and the inhibition efficiency increases with the increase in inhibitor concentration. The effect of temperature on the corrosion behavior of mild steel with the addition of the Schiff base was studied in the temperature range from 25 °C to 65 °C. It is found that the adsorption of this inhibitor follows the Langmuir adsorption isotherms. The value of activation energy and the thermodynamic parameters such as ΔHads, ΔSads, Kads and ΔGads were calculated by the corrosion currents at different temperatures using the adsorption isotherm. The morphology of mild steel surface in the absence and presence of inhibitor was examined by scanning electron microscopy(SEM) images.

Ethanol Extract of Vitex Doniana as a Green Corrosion Inhibitor for Mild Steel in Hydrochloric Acid Medium

Corrosion is a costly and complicated problem facing mild of Vitex doniana as a corrosion inhibitor for mild steel in HCI medium steel utility. This study investigated the use of ethanol extract Experimental methods used are gravimetric and thermometric The results showed that corrosion rate decreased as the concentration of ethanol extract of Vitex doniana increased and with decrease in temperature. Vitex doniana extract obeyed Langmuir and Tempkin adsorption isotherm. Physical adsorption was proposed from △G° and Ea. Inhibition efficiency （1%） and the degree of surface coverage （0） were calculated and all indicated that Vitex doniana was a good corrosion inhibitor.

N-methyl-2-(2-nitrobenzylidene) hydrazine carbothioamide——A new corrosion inhibitor for mild steel in 1 mol·L^(-1)hydrochloric acid

The corrosion inhibition of mild steel in 1 mol·L^(-1) hydrochloric acid by N-methyl-2-(2-nitrobenzylidene)hydrazine carbothioamide(MNBHC) was studied using weight loss and electrochemical studies.Results obtained indicate that the inhibitor is effective in hydrochloric acid medium and the efficiency decreases with increase in temperature.Added halide additives improve the efficiency of the inhibitor.The AC impedance studies reveal that the process of inhibition is through charge transfer.Polarization studies indicate the mixed nature of the inhibitor.From the thermodynamic,spectral and surface analyses the nature of adsorption has been found out.The adsorption of the inhibitor on mild steel follows the Langmuir isotherm.