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首页> 外文期刊>Corrosion >Corrosion Inhibition of 2205 Duplex Stainless Steel in Acetic Acid Solution by Nitrite Anions
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Corrosion Inhibition of 2205 Duplex Stainless Steel in Acetic Acid Solution by Nitrite Anions

机译：亚硝酸根阴离子对乙酸溶液中2205双相不锈钢的缓蚀作用

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摘要

General and pitting corrosion of 2205 duplex stainless steel (UNS S32205) in acetic acid (CH^sub 3^COOH) solution containing 0.01, 0.1, 0.2, and 0.5 M sodium bromide (NaBr) was studied using cyclic potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM) techniques. The influence of nitrite anion as an inhibitor on the pitting corrosion was studied. Pitting potential was found to decrease linearly by increasing the logarithm of bromide ion concentration and was increased by increasing the nitrite ion concentration. Proper inhibition efficiency was achieved by the presence of 500 ppm to 1,000 ppm of nitrite (NO^sup -^^sub 2^) anion. EIS measurements showed that the charge-transfer resistance (R^sub ct^) increased and the constant phase element of the double layer (CPE^sub dl^) decreased by increasing the NO^sup -^^sub 2^ ion concentration. Cyclic potentiodynamic polarization readings showed that the NO^sup -^^sub 2^ anions act as oxidizing agents. The inhibition efficiency was increased with NO^sup -^^sub 2^ ion concentration and the pitting susceptibility depended strongly on nitrite/bromide ion ratio. [PUBLICATION ABSTRACT]
机译：使用循环电势极化，电化学阻抗谱研究了2205双相不锈钢（UNS S32205）在含0.01、0.1、0.2和0.5 M溴化钠（NaBr）的乙酸（CH ^ sub 3 ^ COOH）溶液中的一般腐蚀和点蚀（EIS）和扫描电子显微镜（SEM）技术。研究了亚硝酸根阴离子作为抑制剂对点蚀的影响。发现点蚀电位通过增加溴离子浓度的对数线性降低，并通过增加亚硝酸盐离子浓度而增加。通过存在500ppm至1,000ppm的亚硝酸根（NO 2 -sub 2 sub）阴离子来实现适当的抑制效率。 EIS测量表明，通过增加NO 2 -sub 2-离子浓度，电荷转移电阻（R 2 -sub ct 2）增加并且双层的恒定相元素（CPE 2 -sub dl 2）降低。循环电位极化读数表明，NO 2 -sup 2 ^阴离子充当氧化剂。抑制效率随NO 2 -sup 2 ^离子浓度的增加而增加，点蚀敏感性很大程度上取决于亚硝酸盐/溴化物离子的比率。 [出版物摘要]

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  • 来源
    《Corrosion》 |2010年第7期|p.1-8|共8页
  • 作者

    M Adeli K Raeissi M A Golozar;

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    M. Adeli, * K. Raeissi,[double dagger]* and M.A. Goiozar*Submitted for publication July 4, 2009, in revised form, March 12, 2010.* Corresponding author. E-mail: k_raelssi@cc.iut.ac.ir.* Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.,;

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