Inhibiting stress corrosion cracking by removing corrosion products from the Mg-Zn-Zr alloy pre-exposed to corrosion solutions

摘要: Abstract Magnesium and its alloys are susceptible to stress-corrosion cracking (SCC), which can manifest itself during the slow-strain rate tensile (SSRT) testing in air if specimens were pre-exposed corrosive media. This phenomenon is generally associated with hydrogen embrittlement (HE) believed be related diffusible penetrating into metal pre-exposure. In present study, we show that corrosion product layer deposited on surface of crucial SCC mechanism. The alloy ZK60 SSRT tested air, media, after pre-exposure media as well removal products. To vary severity SCC, four NaCl-based solutions utilised. resulted a marked decrease ductility concurrent appearance multiple side-surface cracks brittle fragments fracture surface. most striking finding study products from results complete recovery mechanical response elimination all harmful embrittling features regardless solution used. effect found inconsistent common viewpoint where mechanism governed entirely by hydrogen. obtained shed new light role hydrogen, irreversible damage Mg