摘要
本文根据外加电位对腐蚀疲劳裂纹扩展速率的影响,断口微观形貌特征及声发射活动性分析三种判别方法,研究了A537钢及工业纯铁在3.5%NaCl中性水溶液中腐蚀疲劳裂纹扩展机理。结果表明,扩展机理取决于外加电位值。对A537钢,外加电位在-800mV(SCE)以上时,裂纹扩展以阳极溶解控制为主,以下时以氢脆控制为主。对工业纯铁,对应的转换电位为-1000mV(SCE)。
The mechanism of corrosion fatigue crack growth for A537 steel and industrial iron in 3.5% NaCl solution was distinguished according to the effect of applied potential, micrograph of fracture surface and acoustic emission activity during crack growth. The mechanism of corrosion fatigue crack growth depended on the applied potentials. There were critical potentials, the value of which were -800mV / SCE for A537 steel and -1000 mV / SCE for indudtrial iron. Anodic dissolution and hydrogen embrittlement played important role above and below this critical potential respectively.
出处
《腐蚀科学与防护技术》
CAS
CSCD
1993年第3期187-191,共5页
Corrosion Science and Protection Technology
关键词
腐蚀疲劳
裂纹扩展
钢
纯铁
机理
corrosion fatigue
crack growth
potential
micrograph of fructure surface
acoustic emission
