镁合金AZ31B在不同pH值NaCl溶液中的应力腐蚀行为研究
发布时间：2018-10-21 08:02
【摘要】：通过慢拉伸应力腐蚀试验机、电化学工作站和扫描电子显微镜(SEM)等手段,研究挤压态镁合金AZ31B在pH=2、7和12的NaCl溶液中的应力腐蚀行为。结果表明,随pH值增大,AZ31B静态腐蚀速率和应力腐蚀敏感性均降低,这是由于碱性溶液更有利于Mg(OH)2表面保护膜的形成。应力腐蚀试验中点蚀形成主要裂纹源,拉伸断口分析表明应力腐蚀具有多裂纹源特征,应力加速腐蚀进程,断裂方式属于穿晶解理断裂。
[Abstract]:The stress corrosion behavior of extruded magnesium alloy AZ31B in NaCl solution of pH=2,7 and 12 was studied by means of slow tensile stress corrosion tester, electrochemical workstation and scanning electron microscope (SEM) (SEM). The results show that the static corrosion rate and stress corrosion sensitivity of AZ31B decrease with the increase of pH value, which is due to the fact that alkaline solution is more favorable to the formation of surface protective film of Mg (OH) _ 2. In the stress corrosion test, the main crack source is formed by pitting corrosion. The tensile fracture analysis shows that stress corrosion has the characteristics of multi-crack source, stress accelerated corrosion process, and the fracture mode belongs to transgranular cleavage fracture.
【作者单位】： 太原理工大学;吕梁学院;
【基金】：国家自然科学基金(51374151,51001079,21201129) 高等学校博士点专项科研基金(20091402110010) 教育部中国博士后科学基金(20100471586) 山西省自然科学基金(2011011020-2,2010021023-1,2013011012-3)
【分类号】：TG172.9
[Abstract]:The stress corrosion behavior of extruded magnesium alloy AZ31B in NaCl solution of pH=2,7 and 12 was studied by means of slow tensile stress corrosion tester, electrochemical workstation and scanning electron microscope (SEM) (SEM). The results show that the static corrosion rate and stress corrosion sensitivity of AZ31B decrease with the increase of pH value, which is due to the fact that alkaline solution is more favorable to the formation of surface protective film of Mg (OH) _ 2. In the stress corrosion test, the main crack source is formed by pitting corrosion. The tensile fracture analysis shows that stress corrosion has the characteristics of multi-crack source, stress accelerated corrosion process, and the fracture mode belongs to transgranular cleavage fracture.
【作者单位】： 太原理工大学;吕梁学院;
【基金】：国家自然科学基金(51374151,51001079,21201129) 高等学校博士点专项科研基金(20091402110010) 教育部中国博士后科学基金(20100471586) 山西省自然科学基金(2011011020-2,2010021023-1,2013011012-3)
【分类号】：TG172.9
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