Zhou Yong, Zhang Pei, Xiong Jinping, Yan Fuan
Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology Wuhan 430205 China
College of Chemistry and Food Science, Yulin Normal University Yulin 537000 China.
RSC Adv. 2019 Jul 30;9(41):23589-23597. doi: 10.1039/c9ra03983j. eCollection 2019 Jul 29.
Herein, for four steels (L80, N80, X65 and Q235) in acidic solutions (HNO, HCl, HAc and CO) containing NO , the relationship between the activation-passivation (A-P) transition and the grain boundary dissolution (GBD) was studied by potentiodynamic polarization curve (PPC) measurements and scanning electron microscopy (SEM) observations. In the specific pH range of acidic solutions, where the four steels showed an electrochemical characteristic of the A-P transition, GBD was observed on the steel surface; however, at low or high pH values of the acidic solutions, the four steels respectively showed the electrochemical behavior of activation (A) or self-passivation (sP), and GBD was not observed on the steel surface. The effects of the acid type, pH value and steel type on the electrochemical characteristic of the A-P transition and the occurrence of GBD were also discussed in detail. this study, it was confirmed that under the electrochemical characteristic of the A-P transition, the occurrence of GBD was a general corrosion behavior of carbon steels and alloy steels in acidic solutions containing NO .
在此，通过动电位极化曲线（PPC）测量和扫描电子显微镜（SEM）观察，研究了四种钢（L80、N80、X65和Q235）在含有NO 的酸性溶液（HNO、HCl、HAc和CO）中活化-钝化（A-P）转变与晶界溶解（GBD）之间的关系。在酸性溶液的特定pH范围内，四种钢呈现出A-P转变的电化学特性，此时在钢表面观察到了GBD；然而，在酸性溶液的低pH值或高pH值时，四种钢分别呈现出活化（A）或自钝化（sP）的电化学行为，且在钢表面未观察到GBD。还详细讨论了酸类型、pH值和钢类型对A-P转变的电化学特性以及GBD发生的影响。在本研究中，证实了在A-P转变的电化学特性下，GBD的发生是碳钢和合金钢在含NO 的酸性溶液中的一种普遍腐蚀行为。
