Mechanism of the element microsegregation induced corrosion difference of Ti6321 weldment

被引：15

作者：

Gao, Shunchang ^{[1
]}

Li, Zhen ^{[1
]}

Fan, Lin ^{[1
]}

Ma, Li ^{[1
]}

Sun, Mingxian ^{[1
]}

机构：

[1] Luoyang Ship Mat Res Inst LSMRI, State Key Lab Marine Corros & Protect, Qingdao 266237, Peoples R China

来源：

CORROSION SCIENCE | 2023年 / 219卷

关键词：

Ti alloys; Microstructural analysis; SKPFM; Corrosion mechanism; Element microsegregation; SURFACE-ANALYSIS; BEHAVIOR; ALLOY; TI; PASSIVATION; PERFORMANCE; MICROSTRUCTURE; TEMPERATURE; OXIDATION; OXYGEN;

D O I：

10.1016/j.corsci.2023.111194

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Herein, we studied the effect of element on corrosion behaviour and on the corrosion films of different zones of a Ti6321 weldment in 5 M hydrochloric acid. The welded material zone (WM) with a lower inner potential dif-ference showed better anti-corrosion properties than that of the base material zone (BM) and heat-affected zone (HAZ). Obvious element microsegregation detected via TEM between the adjacent alpha-and 8-phases of the BM and HAZ, resulting in increasing galvanic corrosion tendency and a deteriorated corrosion film for these zones. Therefore, element microsegregation endangers Ti-based weldments for marine applications.

引用

页数：18

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