阴极面积对3.5%NaCl溶液中304不锈钢稳态点蚀生长速率的影响

doi:10.11902/1005.4537.2017.187

中国腐蚀与防护学报

2018, Vol. 38

Issue (6): 551-557 DOI: 10.11902/1005.4537.2017.187

本期目录 | 过刊浏览

阴极面积对3.5%NaCl溶液中304不锈钢稳态点蚀生长速率的影响

张思齐,杜楠(

),王梅丰,王帅星,赵晴

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

Effect of Cathode Area on Stable Pitting Growth Rate of 304 Stainless Steel in 3.5%NaCl Solution

Siqi ZHANG,Nan DU(

),Meifeng WANG,Shuaixing WANG,Qing ZHAO

1. National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China

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摘要:

采用浸泡实验、动电位极化、电化学阻抗谱和三维视频显微技术研究了阴极面积对3.5% (质量分数) NaCl溶液中304不锈钢稳态点蚀生长速率的影响，模拟了稳态点蚀的生长方式。结果表明，当NaCl溶液中的外加阴极存在时，由于外加阴极的耗氧反应，阳极电位升高，导致金属溶解速率加快。在阴阳极面积比小于64时，阳极溶解速率随着外加阴极面积的增加而增加；在阴阳极面积比达到并超过64时，阳极腐蚀速率增量趋于平缓，约为无外加阴极时的2.2倍。外加阴极存在时，FeCl₃溶液中的析氢反应速率也得到提升。当304不锈钢在3.5%NaCl溶液中自然产生点蚀时，蚀孔外阴极可提高蚀孔底部金属的溶解速率。

关键词 ：稳态点蚀, 蚀孔模拟, 阴极反应, 304不锈钢

Abstract：

The effect of cathode area on stable pitting grows of 304 stainless steel in 3.5% (mass fraction) NaCl solution was investigated by means of immersion test, electrochemical impendence spectroscope (EIS), potentiodynamic polarization and three-dimensional video microscope. The growth of stable pitting was then simulated. The results showed that when an impressed cathode was present in the solution, the dissolution rate of anode was dramatically enhanced: as the area radio of cathode to anode enlarged from 1 to 64, the corrosion increased, however, when the radio reached 64 and above, the corrosion rate tended to be stable. At this time the current density is 2.2 times of that without additional cathode. With the presence of an impressed cathode，the rate of hydrogen evolution reaction could increase in FeCl₃solution. The presence of an impressed cathode could also increase the anodic dissolution rate of the bottom of a naturally grown pit on 304 stainless in 3.5%NaCl solution according to the results of simulated experiment.

Key words： stable pitting pit stimulation cathodic reaction 304 stainless steel

收稿日期: 2017-11-13

ZTFLH:

TG174

基金资助:国家自然科学基金(51561024)

通讯作者: 杜楠 E-mail: d_nan@sina.com

Corresponding author: Nan DU E-mail: d_nan@sina.com

作者简介: 张思齐，男，1992年生，硕士生

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引用本文:

张思齐,杜楠,王梅丰,王帅星,赵晴. 阴极面积对3.5%NaCl溶液中304不锈钢稳态点蚀生长速率的影响[J]. 中国腐蚀与防护学报, 2018, 38(6): 551-557.
Siqi ZHANG, Nan DU, Meifeng WANG, Shuaixing WANG, Qing ZHAO. Effect of Cathode Area on Stable Pitting Growth Rate of 304 Stainless Steel in 3.5%NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2018, 38(6): 551-557.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.187 或 https://www.jcscp.org/CN/Y2018/V38/I6/551

图1 实验装置图

图2 304不锈钢试样浸泡在3.0 mol/L FeCl3溶液中不同时间的失重曲线

图3 不同阴阳极面积比的304不锈钢电极在FeCl3溶液中的极化曲线

表1 不同阴阳极面积比条件下极化曲线拟合参数值

图4 阴阳极面积比对FeCl3溶液中304不锈钢开路电位的影响

图5 阴阳极面积比对FeCl3溶液中304不锈钢自腐蚀电流密度的影响

表2 外加不同面积阴极后理论极限电流密度增量

图6 不同阴阳极面积比下动电位极化后阳极腐蚀形貌

图7 不同阴阳极面积比下304不锈钢在FeCl3溶液中的电化学阻抗谱

图8 不同阴阳极面积比的电化学阻抗谱等效电路图

表3 不同阴阳极面积比下的电化学阻抗谱拟合数据

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