The Comparative Investigation of Corrosion and Passivation for X65 Carbon Steel in pH 1 to 5 HNO3 Solutions without and with 0.01 mol L-1 NaNO2
The Comparative Investigation of Corrosion and Passivation for X65 Carbon Steel in pH 1 to 5 HNO3 Solutions without and with 0.01 mol L-1 NaNO2
复制标题
X65碳钢在pH 1～5 HNO3溶液中不含和含有0.01 mol·L-1 NaNO2的腐蚀和钝化对比研究
DOI：
10.21577/0103-5053.20190237
复制
发表时间：
2020-04-01
影响因子：
1.4
通讯作者：
Zhou, Yong
中科院分区：
文献类型：
--
作者：
Deng, Rongjiao;Zhang, Pei;Zhou, Yong
采用电化学方法和显微结构技术研究了0.01 mol L-1 NaNO（2）对X65碳钢在pH 1 ~ 5的HNO 3溶液中腐蚀和钝化的影响。在pH 1 ~ 5的无NaNO 2溶液中，X65钢呈现出活性溶解的电化学特征，腐蚀速率随pH值的升高而逐渐降低。相比之下，在pH 1 ~ 5的HNO 3溶液中加入0.01 mol L-1的NaNO 2后，X65碳钢的电化学特性由在无NaNO 2的pH 1 ~ 5溶液中的活性溶解转变为在含NaNO 2的pH 1 ~ 5溶液中的阳极钝化。X65钢在pH值为1 ~ 5的NaNO 2溶液中，随着pH值的升高，腐蚀速率也逐渐降低，但钝化能力明显增强。X65碳钢在pH值为1 ~ 5的HNO 3溶液中的腐蚀和钝化与H+还原、O-2还原和NO2-/HNO 2还原等阴极反应有关。
The influence of 0.01 mol L-1 NaNO(2 )addition on the corrosion and passivation of X65 carbon steel in pH 1 to 5 HNO3 solutions was investigated and compared by electrochemical methods and microstructural techniques. In the pH 1 to 5 solutions without NaNO2, the X65 steel presented the electrochemical characteristic of active dissolution, and the corrosion rate of X65 carbon steel decreased gradually with the raise of pH value. By contrast, with the addition of 0.01 mol L-1 NaNO2 in pH 1 to 5 HNO3 solutions, the electrochemical characteristic of X65 carbon steel transferred from the active dissolution in the pH 1 to 5 solutions without NaNO2 to the anodic passivation in the corresponding pH solutions with NaNO2. For the X65 steel in the pH 1 to 5 solutions with NaNO2, with the raise of pH value, the corrosion rate also decreased gradually but the passivation capability strengthened obviously. The corrosion and passivation of X65 carbon steel in pH 1 to 5 HNO3 solutions without and with 0.01 mol L-1 NaNO2 were related to the cathodic reactions of H+ reduction, O-2 reduction and NO2-/HNO2 reduction.