Effects of Inhibitors on Corrosion Resistance of Steel in CaCl 2 Solution Based on Response Surface Analysis

IF 0.8 Q4 ELECTROCHEMISTRY

Corrosion Science and Technology-Korea Pub Date : 2021-06-30 DOI:10.14773/CST.2021.20.3.129

H. Jang

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引用次数: 1

Abstract

Effects of corrosion inhibitors (i.e., sodium nitrite, sodium hexametaphosphate, trimethylamine (TEA), sugar, and urea) on the corrosion resistance of carbon steel in CaCl2 solution were investigated. The test solution was designed with response surface methodology of design of experiments (DOE) in the range of 0 ~ 50 ppm for NaNO2, 0 ~ 200 ppm for (NaPO3)6, 0 ~ 2000 ppm for TEA, 0 ~ 3000 ppm for sugar, 0 ~ 200 ppm for urea with 3 wt% CaCl2. The corrosion potential and the corrosion rate were measured with potentiodynamic polarization tests and analyzed statistically to find main effects of inhibitor concentrations and interactions between them. As a result, hexametaphosphate was the most effective compound in reducing the corrosion rate. Sugar also reduced the corrosion rate significantly possibly because it covered the surface effectively with a high molecular weight. The inhibiting action of sugar was found to be enhanced by adding trimethylamine into the solution. Nevertheless, trimethylamine did not appear to be effective in inhibiting corrosion by itself. However, urea and sodium nitrite showed almost no inhibition on corrosion resistance of steel.

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基于响应面分析的缓蚀剂对钢在cacl2溶液中耐蚀性的影响

研究了缓蚀剂（即亚硝酸钠、六偏磷酸钠、三甲胺（TEA）、糖和尿素）对碳钢在CaCl2溶液中耐腐蚀性的影响。试验溶液采用响应面实验设计法（DOE）设计，NaNO2在0~50ppm，（NaPO3）6在0~200ppm，TEA在0~2000ppm，糖在0~3000ppm，尿素在0~200ppmCaCl2的范围内。通过动电位极化试验测量了腐蚀电位和腐蚀速率，并对其进行了统计分析，以找出缓蚀剂浓度及其相互作用的主要影响因素。因此，六偏磷酸盐是降低腐蚀速率最有效的化合物。糖还显著降低了腐蚀速率，可能是因为它用高分子量有效地覆盖了表面。发现在溶液中加入三甲胺可以增强糖的抑制作用。然而，三甲胺本身似乎并不能有效地抑制腐蚀。尿素和亚硝酸钠对钢的耐蚀性几乎没有抑制作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Corrosion Science and Technology-Korea ELECTROCHEMISTRY-

CiteScore

1.30

自引率

66.70%

发文量