Metallurgical and Electrochemical Characterization of the Corrosion of a Mg-Al-Zn Alloy AZ31B-H24 Tungsten Inert Gas Weld: Galvanic Corrosion Between Weld Zones

摘要: Several techniques were used to investigate magnesium alloy, AZ31B-H24, joined by tungsten inert gas welding, primarily utilizing multichannel multi-electrode arrays in conjunction with situ time lapse video, scanning electron microscope and Raman surface analysis, mixed potential theory. Time optical videos examined the dominant location of hydrogen evolution reaction darkening within various weld zones, which is considered characteristic anodic zones cathodic activation Mg alloys. The galvanic coupling between electrochemically connected was investigated 0.6 M NaCl, NaCl saturated Mg(OH)2, tris(hydroxymethyl)aminomethane (TRIS). Anodically-induced also after 3 h, 24 h, 48 h immersion times 0.1 M TRIS. main goal characterize explain corrosion time. Both heat affected wrought base plate corrode initially relative the...