pH值对304不锈钢在3.5%NaCl溶液中点蚀过程的影响

doi:10.11902/1005.4537.2013.259

中国腐蚀与防护学报

2015, Vol. 35

Issue (1): 38-42 DOI: 10.11902/1005.4537.2013.259

本期目录 | 过刊浏览

pH值对304不锈钢在3.5%NaCl溶液中点蚀过程的影响

叶超¹, 杜楠¹(

), 田文明², 赵晴¹, 朱丽³

1. 南昌航空大学轻合金加工科学与技术国防重点学科实验室南昌 330063
2. 北京航空航天大学材料科学与工程学院北京 100191
3. 中航工业成飞制造工程部成都 610092

Effect of pH on Pitting Corrosion Process of 304 Stainless Steel in 3.5%NaCl Solution

YE Chao¹, DU Nan¹(

), TIAN Wenming², ZHAO Qing¹, ZHU Li³

1. Key Discipline Laboratory of National Defence of Light Alloy Processing Science and Technology Institute, Nanchang Hangkong University, Nanchang 330063, China
2. School of Materials Science and Engineering, Beihang University, Beijing 100191, China
3. Department of AVIC Chengdu Manufacturing Engineering, Chengdu 610092, China

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摘要:

采用恒电位极化及三维视频显微技术研究不同pH值对304不锈钢在3.5%NaCl溶液中单个蚀孔的点蚀动力学及腐蚀形貌特征的影响。结果表明,当pH值等于1,4,7,10和14,极化电位为0.15 V_vs_SCE时,单个蚀孔的点蚀电流、蚀孔体积、深度及孔口直径的增加速率随pH值的降低而增大。在同一pH值下,孔深的增加速率随时间的延长而增大,孔口直径的增加速率随时间的延长而减小。不同pH值下,单个蚀孔的生长均受腐蚀产物扩散控制。蚀孔表面为多孔花边盖,并且花边盖板的完整度随pH值的降低而下降。

关键词 ： 304不锈钢, pH值, 点蚀动力学, 腐蚀形貌, 扩散控制

Abstract：

Effect of pH values on pitting dynamics and morphology of single pits of 304 stainless steel in 3.5%NaCl solution was studied by means of potentiostatic polarization and 3-dimensional video microscope. The results showed that the pitting current, the growth rate of pit volume, the pit depth and pit mouth diameter of single pits increase with the decreasing pH in a range 1 to 14 by applied potential of 0.15 V_vs_SCE. In solutions with the same pH, the growth rate of pit depth increases with time, while the growth rate of pit mouth diameter decreases with time. In solutions with different pH, the growth of single pit is controlled by the diffusion through corrosion products. There exists lacy cover on the wall of pit mouth, and the integrity of the lacy cover declines with the increase of pH.

Key words： 304 stainless steel pH pitting dynamics corrosion morphology diffusion controlled

ZTFLH:

TG172

基金资助:国家自然科学基金项目 (51071083) 资助

作者简介: null

叶超，女，1988年生，硕士生

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引用本文:

叶超, 杜楠, 田文明, 赵晴, 朱丽. pH值对304不锈钢在3.5%NaCl溶液中点蚀过程的影响[J]. 中国腐蚀与防护学报, 2015, 35(1): 38-42.
Chao YE, Nan DU, Wenming TIAN, Qing ZHAO, Li ZHU. Effect of pH on Pitting Corrosion Process of 304 Stainless Steel in 3.5%NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(1): 38-42.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.259 或 https://www.jcscp.org/CN/Y2015/V35/I1/38

图1 在3.5%NaCl溶液中, 不同pH值下单个蚀孔点蚀电流随时间的变化

表1 不同pH值下极化后单个蚀孔的参数

图2 在3.5%NaCl溶液中, 不同pH值下单个蚀孔体积随时间的变化

图3 在3.5%NaCl溶液中, 不同pH值下单个蚀孔深度和口径深度随时间的变化

图4 在3.5%NaCl溶液中, 不同pH值下单个蚀孔电流密度随时间的变化

图5 在3.5%NaCl溶液中, 不同pH值下蚀孔表面金属盖板形貌图

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