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热处理对轧制态Mg5Gd合金腐蚀行为的影响

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通过浸泡试验、电化学测试、扫描电化学显微镜和腐蚀形貌分析等手段研究热处理工艺对轧制态Mg5Gd合金在3.5 wt.％NaCl饱和Mg(OH)2溶液中腐蚀行为的影响及机理,以期达到提高镁合金耐蚀性的目的.结果表明:固溶处理能显著降低Mg5Gd合金的腐蚀速率,并且使其腐蚀变均匀,腐蚀坑变浅,这主要归因于固溶处理可以熔解镁基体中大量的富Gd二次相颗粒.固溶处理后的退火处理能进一步降低Mg5Gd合金的腐蚀速度.在退火过程中,从镁基体中沉淀出的纳米颗粒未造成明显的微电偶腐蚀,这主要是因为在纳米相颗粒表面生成的保护性产物膜完全覆盖了颗粒,从而阻止微电偶腐蚀的产生.
Influence of heat treatment on corrosion behavior of hot rolled Mg5Gd alloys
The influence of heat treatment on the corrosion behavior of rolled Mg5Gd alloys in 3.5 wt.％ NaCl solution saturated with Mg(OH)2 was characterized by immersion test, electrochemical test, scanning electrochemical microscopy (SECM) and corrosion morphology analysis in order to improve the corrosion resistance of Mg alloys. The results showed that solution treatment reduced the corrosion rate of the Mg5Gd significantly, resulting in relatively uniform corrosion and shallow corrosion cavities due to the dissolution of Cd-containing particles. The following aging process could further decrease the corrosion rate. Precipitation of nano-sized Cd-containing particles did not cause apparent micro-galvanic corrosion, which could be attributed to the formation of a protective corrosion product film fully covering the particles.

magnesium alloyrare earthcorrosion resistancemicrostructureheat treatment

曹福勇、张婧、李可可、宋光铃

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厦门大学 材料学院 海洋材料腐蚀与防护中心,厦门 361005

厦门大学 化学化工学院 固体表面物理化学国家重点实验室,厦门 361005

School of Engineering, The University of Queensland, St. Lucia, Qld 4072, Australia

镁合金 稀土 耐腐蚀性 显微组织 热处理

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Fujian ProvinceChina,and National Environmental Corrosion Platform of China

51801168517310082018J05093

2021

10.1016/S1003-6326(21)65551-6

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(4)
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