304不锈钢点蚀产物对亚稳态点蚀萌生和稳态蚀孔生长的加速作用

doi:10.11902/1005.4537.2018.144

中国腐蚀与防护学报

2019, Vol. 39

Issue (4): 338-344 DOI: 10.11902/1005.4537.2018.144

研究报告

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304不锈钢点蚀产物对亚稳态点蚀萌生和稳态蚀孔生长的加速作用

王标,杜楠(

),张浩,王帅星,赵晴

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

Accelerating Effect of Pitting Corrosion Products on Metastable Pitting Initiation and the Stable Pitting Growth of 304 Stainless Steel

WANG Biao,DU Nan(

),ZHANG Hao,WANG Shuaixing,ZHAO Qing

National Defense Key Discipline Laboratory of Alloy Processing Scienceand Technology, Nanchang Hangkong University, Nanchang 330063, China

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摘要:

用强制改变304不锈钢表面点蚀产物浓度的方法研究了点蚀产物浓度在亚稳态蚀孔的萌生过程及稳态蚀孔生长过程中的加速作用。结果表明，随着304不锈钢试样表面点蚀产物浓度的降低，点蚀孕育期增加，恒电位极化的平均峰值电流和平均峰值宽度显著减少，蚀孔数量显著减少，稳态蚀孔的体积、蚀孔横向生长速度下降。随着蚀孔宽深比的下降和蚀孔的生长，蚀孔内点蚀产物浓度再次增加，腐蚀速率增大。点蚀产物浓度是亚稳态蚀孔萌生和稳态蚀孔生长的关键因素。

关键词 ：亚稳态点蚀, 稳态点蚀, 搅拌, 恒电位极化

Abstract：

The acceleration effect of the concentration of pitting corrosion products on the metastable pitting initiation and the stable pitting growth of 304 stainless steel was studied by changing the concentration of pitting products on the surface of 304 stainless steel compulsively. There are three characteristic indexes of metastable pitting initiation process with the decreasing concentration of pitting products, namely the increase of pitting incubation period, the reduce of average peak current and average peak width, and the decrease of pits number. The volume and the transverse growth rate of pits decreases. With the decreasing ratio of pits width to depth and the growth of pits, the concentration of pitting products in pits increases again and the corrosion rate increases. The concentration of pitting products is certainly the key factor for metastable pitting initiation and steady pitting growth.

Key words： metastable pitting stable pitting stir potentiostatic polarization

收稿日期: 2018-10-08

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: 王标，男，1992年生，硕士生

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引用本文:

王标,杜楠,张浩,王帅星,赵晴. 304不锈钢点蚀产物对亚稳态点蚀萌生和稳态蚀孔生长的加速作用[J]. 中国腐蚀与防护学报, 2019, 39(4): 338-344.
Biao WANG, Nan DU, Hao ZHANG, Shuaixing WANG, Qing ZHAO. Accelerating Effect of Pitting Corrosion Products on Metastable Pitting Initiation and the Stable Pitting Growth of 304 Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2019, 39(4): 338-344.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.144 或 https://www.jcscp.org/CN/Y2019/V39/I4/338

图1 实验装置图

图2 304不锈钢在3.5%NaCl溶液中不同搅拌速度下亚稳蚀孔暂态电流与时间的关系

图3 亚稳态蚀孔平均峰值电流、平均峰值宽度、蚀孔数目和点蚀孕育期与转速的关系

图4 3.5%NaCl溶液中不同搅拌速度下单个蚀孔点蚀电流与时间的关系

图5 在3.5%NaCl溶液中不同搅拌速度下单个蚀孔体积与时间的关系

Stirring rate r / min	D / μm	d / μm	H / μm	V / μm³	$D H$	$d H$
0	175	103	105	1.61×10⁶	1.67	0.98
100	133	85	90	8.36×10⁵	1.47	0.94
300	125	79	87	7.45×10⁵	1.43	0.90
500	89	62	75	3.54×10⁵	1.18	0.82

表1 不同搅拌速度下极化后单个蚀孔的几何参数

图6 在3.5%NaCl溶液中不同搅拌速度下单个蚀孔口径随时间的变化

图7 不同搅拌速度条件下单个稳态蚀孔表面形貌及其三维重构图

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