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中国腐蚀与防护学报  2015, Vol. 35 Issue (3): 233-238    DOI: 10.11902/1005.4537.2014.080
  研究报告 本期目录 | 过刊浏览 |
两种不锈钢在模拟消声器环境中的电偶腐蚀行为
魏强,李谋成(),沈嘉年
Galvanic Corrosion Behavior of Two Stainless Steels in Simulated Muffler Environments
Qiang WEI,Moucheng LI(),Jianian SHEN
Institute of Materials, Shanghai University, Shanghai 200072, China
全文: PDF(1963 KB)   HTML
摘要: 

采用氧化/冷凝液浸泡循环实验方法模拟汽车消声器内部环境,研究了409和304两种不锈钢在冷凝液中的电偶腐蚀行为。结果表明,无氧化作用时两种不锈钢间电偶腐蚀效应较弱,304钢对409钢的加速腐蚀作用很小。循环实验过程中,偶合电位较低时偶合电流密度往往较大。热氧化将明显增大两种不锈钢发生电偶腐蚀的倾向性,但氧化温度为250 ℃时稳定偶合电流密度较小、电偶腐蚀效应不显著,而氧化温度为400 ℃时409钢在循环过程中将发生局部腐蚀,呈现出较大的偶合电流密度,电偶腐蚀效应较强。
关键词 ： 汽车排气系统,  消声器,  不锈钢,  电偶腐蚀,  冷凝液腐蚀    
Abstract：

The cyclic method of hot air oxidation/immersion in condensates was adopted to simulate the internal service conditions of automotive mufflers. The galvanic corrosion between type 409 and 304 stainless steels was investigated during the condensates immersion by using electrochemical measurements. The results of coupling potential and current indicate that the galvanic corrosion effect is very weak between these two steels without suffered from hot air oxidation. This means that 304 stainless steel can hardly accelerate the corrosion of 409 stainless steel as they contact directly in the condensate solutions. During the cyclic tests, the two steels show relatively higher values for the coupling current in the low coupling potential cases. Hot air oxidation will enhance the galvanic corrosion tendency between the two steels. However, they show small coupling current densities after cyclic oxidation at 250 ℃, with weak galvanic corrosion effect between them. Whereas they display large coupling current densities (i.e. strong galvanic corrosion effect) with the occurrence of localized corrosion after cyclic oxidation at 400 ℃.
Key words： automotive exhaust system    muffler    stainless steel    galvanic corrosion    condensate corrosion
    
基金资助:国家自然科学基金项目 (51134010) 资助
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引用本文:

魏强,李谋成,沈嘉年. 两种不锈钢在模拟消声器环境中的电偶腐蚀行为[J]. 中国腐蚀与防护学报, 2015, 35(3): 233-238.
Qiang WEI, Moucheng LI, Jianian SHEN. Galvanic Corrosion Behavior of Two Stainless Steels in Simulated Muffler Environments. Journal of Chinese Society for Corrosion and protection, 2015, 35(3): 233-238.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.080      或      https://www.jcscp.org/CN/Y2015/V35/I3/233

Steel Cr Ni Mn Si C P S N Cu Ti Fe
304 18.11 8.19 1.06 0.43 0.05 0.025 0.001 0.039 0.55 --- Bal.
409 11.46 0.09 0.54 0.45 0.007 0.025 0.002 --- 0.02 0.19 Bal.
表1  不锈钢试样的化学组成
图1  409和304不锈钢在冷凝液中的腐蚀电位-时间曲线
图2  409钢和304钢的偶合电位与偶合电流密度随时间的变化曲线
图3  不同氧化温度条件下两种试样的腐蚀电位随氧化/浸泡实验循环周期的演变曲线
图4  两种钢在250 ℃氧化/浸泡循环实验不同周期时的典型偶合电位和电流密度曲线
图5  两种钢在400 ℃氧化/浸泡实验循环不同周期时的典型偶合电位和电流密度曲线
图6  两种氧化温度条件下偶合电位和电流密度随氧化/浸泡实验循环周期的演变曲线
图7  未偶合与偶合的409不锈钢试样经30次氧化/浸泡循环实验后表面的SEM像
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