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Enhancement of resistance to galvanic corrosion of ZE41 Mg alloy by equal channel angular pressing
Materials and Corrosion ( IF 1.6 ) Pub Date : 2019-12-10 , DOI: 10.1002/maco.201911337
Prithivirajan Sekar 1 , Narendranath Sanna 1 , Vijay Desai 1
Affiliation  

The galvanic corrosion behavior of as‐received and ECAPed ZE41 Mg alloy coupled with Al7075 alloy is investigated using zero resistance ammeter in three different corrosive environments, 0, 0.1, and 1 M NaCl, to mimic the conditions experienced in engineering applications. The mechanism of galvanic corrosion for the ZE41 Mg–Al7075 aluminum alloy is explained. It is observed that a robust surface film containing a composite layer of oxide/hydroxide of magnesium and aluminum is established in deionized water (0 M). However, only a single layer of magnesium oxide/hydroxide is detected in chloride‐containing environments. Equal channel angular pressing (ECAP) improved the resistance to galvanic corrosion by 58% and 54% when compared with the as‐cast counterparts in 0 and 1 M NaCl solution, respectively. In contrast, galvanic corrosion resistance decreased by 26% in 0.1 M NaCl after ECAP while the as‐received samples evinced pits unfavorable to be used in engineering applications. ECAP is a promising method to combat galvanic corrosion encountered by ZE41 magnesium alloy used in automobiles and components of military vehicles.

中文翻译:

等通道角向压制提高ZE41 Mg合金的耐电偶腐蚀性能

在零,0.1和1 M NaCl三种不同腐蚀环境下,使用零电阻电流表研究了接收到的ECAPed ZE41 Mg合金与Al7075合金的电偶腐蚀行为,以模拟工程应用中遇到的条件。解释了ZE41 Mg–Al7075铝合金的电化腐蚀机理。可以看出,在去离子水(0 M)中建立了坚固的表面膜,该膜包含镁和铝的氧化物/氢氧化物的复合层。但是,在含氯化物的环境中仅检测到单层氧化镁/氢氧化镁。与在0 M和1 M NaCl溶液中浇铸的铸件相比,等通道角压(ECAP)分别使抗电腐蚀性能提高了58%和54%。相反,在ECAP之后,在0.1 M NaCl中,耐电偶腐蚀性能下降了26%,而所接收的样品显示出不适合在工程应用中使用的凹坑。ECAP是一种有前途的方法,可以抵抗汽车和军用车辆部件中使用的ZE41镁合金遇到的电偶腐蚀。
更新日期:2019-12-10
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