铸造AZ91镁合金在CO3^2-/HCO3^-体系中的应力腐蚀行为

IMR OpenIR

	铸造AZ91镁合金在CO3^2-/HCO3^-体系中的应力腐蚀行为
其他题名	STRESS CORROSION CRACKING BEHAVIORS OF AS-CAST AZ91 MAGNESIUM ALLOY IN CO_3~（2-）-/HCO_3~-SOLUTIONS
	黄发; 陈健; 王俭秋
	2010
发表期刊	中国腐蚀与防护学报
ISSN	1005-4537
卷号	30.0 期号:005 页码:347-353
摘要	用电化学实验、浸泡实验与慢应变速率拉伸实验研究铸造AZ91镁合金在不同浓度比例的CO3^2-/HCO3^-溶液体系中的应力腐蚀（SCC）行为。结果表明,随着溶液pH值的升高,AZ91镁合金的应力腐蚀敏感性降低。点蚀是AZ91镁合金在该实验体系下的裂纹萌生源,随着实验时间的延长,萌生于点蚀底部的微裂纹会逐渐扩展形成主裂纹,主裂纹靠吞并其前端的微裂纹向前扩展,直至发生SCC失效。
其他摘要	The stress corrosion cracking（SCC） behaviors of as-cast AZ91 magnesium alloy in CO_3~（2-）/HCO_3~- solutions were investigated by electrochemical test,immersion test and slow strain rate test（SSRT） respectively. The results showed that the stress corrosion cracking sensitivity of as-cast AZ91 alloy in CO_3~（2-）/HCO_3~- solutions decreased with the increase of pH values of the solutions.The surface was covered by a film mainly composed of Mg（OH）_2 and Al（OH）_3.Al（OH）_3 could be dissolved in alkaline solutions and AlO_2~- engendered.Pitting was the main crack source of AZ91 alloy in such solutions.The cracking ofβphase also resulted in microcracks in the matrix.Microcracks initiating at the bottom of pitting combined into a main crack.The main crack propagated by coalescence of the existing microcracks ahead until the SCC fracture occurred.
关键词	AZ91镁合金应力腐蚀开裂 CO3^2-/HCO3^-溶液
收录类别	CSCD
语种	中文
CSCD记录号	CSCD:4050718
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/142989
专题	中国科学院金属研究所
作者单位	中国科学院金属研究所
推荐引用方式 GB/T 7714	黄发,陈健,王俭秋. 铸造AZ91镁合金在CO3^2-/HCO3^-体系中的应力腐蚀行为[J]. 中国腐蚀与防护学报,2010,30.0(005):347-353.
APA	黄发,陈健,&王俭秋.(2010).铸造AZ91镁合金在CO3^2-/HCO3^-体系中的应力腐蚀行为.中国腐蚀与防护学报,30.0(005),347-353.
MLA	黄发,et al."铸造AZ91镁合金在CO3^2-/HCO3^-体系中的应力腐蚀行为".中国腐蚀与防护学报 30.0.005(2010):347-353.