【摘要】：通過慢拉伸應(yīng)力腐蝕試驗(yàn)機(jī)、電化學(xué)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(yīng)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(yīng)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(hù)膜的形成。應(yīng)力腐蝕試驗(yàn)中點(diǎn)蝕形成主要裂紋源,拉伸斷口分析表明應(yīng)力腐蝕具有多裂紋源特征,應(yīng)力加速腐蝕進(jìn)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(xué);呂梁學(xué)院;
【基金】：國家自然科學(xué)基金(51374151,51001079,21201129) 高等學(xué)校博士點(diǎn)專項(xiàng)科研基金(20091402110010) 教育部中國博士后科學(xué)基金(20100471586) 山西省自然科學(xué)基金(2011011020-2,2010021023-1,2013011012-3)
【分類號(hào)】：TG172.9

【參考文獻(xiàn)】

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