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On the role of hydrogen in stress corrosion cracking of magnesium and its alloys: Gas-analysis study

机译：氢在镁及其合金的应力腐蚀开裂中的作用：气体分析研究

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One of the main challenges impeding wider uptake of magnesium alloys by the industry is their poor resistance to general corrosion and stress-corrosion cracking (SCC), the nature of which is not fully understood. Although SCC is generally associated with hydrogen embrittlement, the experimental data on the possible hydrogen state, concentration and distribution in Mg is scarce, and its role in SCC is unclear. These issues are addressed in the present study using as-cast technically pure Mg as well as wrought ZK60 and AZ31 alloys slow-strain rate tensile tested in air and in corrosive media before and after prestraining. Hydrogen concentration and extraction curves have been obtained and analyzed for the specimens tested in corrosive media. It is found that most part of hydrogen is contained in the corrosion products while the concentration of diffusible hydrogen in the matrix is negligible for all the materials studied. On the basis of fractographic observations combined with gas-analysis and mechanical testing data, it is suggested that SCC of the ZK60 and AZ31 alloys results from brittle cracking of a surface hydride film, while SCC of pure Mg is likely associated with adsorbed hydrogen facilitating ductile fracture.
机译：阻碍行业广泛吸收镁合金的主要挑战之一是其对一般腐蚀和应力腐蚀开裂（SCC）的抵抗力差，其性质尚未完全了解。尽管SCC通常与氢脆有关，但有关Mg中可能的氢状态，浓度和分布的实验数据很少，尚不清楚其在SCC中的作用。在本研究中，使用铸态技术纯Mg以及锻造的ZK60和AZ31合金慢应变速率拉伸在预应变前后在空气和腐蚀性介质中进行了测试，从而解决了这些问题。已获得氢气浓度和萃取曲线，并对在腐蚀性介质中测试的样品进行了分析。已发现，腐蚀产物中大部分包含氢，而所有研究材料中基质中可扩散氢的浓度均可以忽略不计。根据分形学观察结果，结合气体分析和力学测试数据，表明ZK60和AZ31合金的SCC由表面氢化物膜的脆裂产生，而纯Mg的SCC可能与吸附的氢有关，有助于延展韧性断裂。

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