【摘要】：通過慢拉伸應力腐蝕試驗機、電化學工作站和掃描電子顯微鏡(SEM)等手段,研究擠壓態(tài)鎂合金AZ31B在pH=2、7和12的NaCl溶液中的應力腐蝕行為。結(jié)果表明,隨pH值增大,AZ31B靜態(tài)腐蝕速率和應力腐蝕敏感性均降低,這是由于堿性溶液更有利于Mg(OH)2表面保護膜的形成。應力腐蝕試驗中點蝕形成主要裂紋源,拉伸斷口分析表明應力腐蝕具有多裂紋源特征,應力加速腐蝕進程,斷裂方式屬于穿晶解理斷裂。
[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.
【作者單位】： 太原理工大學;呂梁學院;
【基金】：國家自然科學基金(51374151,51001079,21201129) 高等學校博士點專項科研基金(20091402110010) 教育部中國博士后科學基金(20100471586) 山西省自然科學基金(2011011020-2,2010021023-1,2013011012-3)
【分類號】：TG172.9

【參考文獻】

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