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中国腐蚀与防护学报  2016, Vol. 36 Issue (2): 165-171    DOI: 10.11902/1005.4537.2015.227
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蒸汽环境对消声器用439不锈钢腐蚀行为的影响
汪长鹏,申宇凤,陈聪聪,李谋成()
上海大学材料研究所 上海 200072
Effect of Exposure to Steam on Corrosion of Type 439 Stainless Steel for Automotive Mufflers
Changpeng WANG,Yufeng SHEN,Congcong CHEN,Moucheng LI()
Institute of Materials, Shanghai University, Shanghai 200072, China
全文: PDF(983 KB)   HTML
摘要: 

运用氧化-浸泡循环实验和氧化-浸泡-蒸发循环实验,结合电化学测试以及SEM和XRD分析,研究了蒸汽环境对消声器用439不锈钢腐蚀行为的影响。结果表明：有/无蒸汽作用条件下,试样表面形成的腐蚀产物相似,循环实验后试样表面均生成了较浅的点蚀坑。与冷凝液环境相比,试样在蒸汽环境中的腐蚀阻力较小、局部腐蚀坑更深。蒸汽环境更有利于试样表面产物膜和蚀坑的生长。
关键词 ： 汽车排气系统,  冷凝液腐蚀,  蒸汽环境,  点蚀    
Abstract：

The influence of steam on the corrosion behavior of 439 stainless steel for automotive mufflers was studied by means of cyclic hot air oxidation-immersion in condensate test and cyclic hot air oxidation-immersion in condensate-exposure to steam test as well as electrochemical measurements, SEM, XRD and pitting depth analyses. The results show that all the specimens, after cyclic hot air oxidation-immersion in condensate test and then with and without subsequent exposure to steam test, suffered from pitting corrosion with similar corrosion products. However, the specimens show lower corrosion resistance and deeper corrosion pits when they had experienced the exposure to steam test rather than those only experienced the cyclic hot air oxidation-immersion in condensate test. The exposure to steam may facilitate the growth of corrosion products and pits.
Key words： automobile exhaust system    condensate corrosion    steam    pitting
    
基金资助:国家自然科学基金项目 (51134010) 资助
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汪长鹏
申宇凤
陈聪聪
李谋成

引用本文:

汪长鹏,申宇凤,陈聪聪,李谋成. 蒸汽环境对消声器用439不锈钢腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2016, 36(2): 165-171.
Changpeng WANG, Yufeng SHEN, Congcong CHEN, Moucheng LI. Effect of Exposure to Steam on Corrosion of Type 439 Stainless Steel for Automotive Mufflers. Journal of Chinese Society for Corrosion and protection, 2016, 36(2): 165-171.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.227      或      https://www.jcscp.org/CN/Y2016/V36/I2/165

图1  浸泡实验和蒸汽实验的实验装置示意图
Step GA GB
1 Oxidized in air at 400 ℃ for 1 h, then cooled to room temperature Oxidized in air at 400 ℃ for 1 h, then cooled to room temperature
2 Immersed in condensate at 80 ℃ for 10 h Immersed in condensate at 80 ℃ for 2 h
3 --- Exposed in steam environment at 80 ℃ for 8 h
表1  GA和GB两组试样单个循环实验流程
图2  GA和GB组试样除锈前后表面形貌的SEM像
图3  循环实验后试样腐蚀产物的XRD谱
图4  两组试样的腐蚀电位随循环周期的变化曲线
图5  GA和GB两组试样不同循环周期后的电化学阻抗谱
图6  试样腐蚀的等效电路模型
图7  Rf和Rt的拟合结果
图8  两组试样的点蚀坑深度
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