Corrosion inhibition in magnesium-aluminium-based alloys induced by rapid solidification processing

摘要: The effect of rapid solidification on the corrosion behaviour in aerated 0.001 M NaCl solution Mg-Al alloys containing 9.6 to 23.4wt% AI has been investigated comparison with chill-cast material. Polarization studies show that decreases current by up two orders magnitude corresponding a rate 6 11 mil y−1. Increasing aluminium content solid gave rise steep increase pitting potential between 10 and 23 wt% Al resulted development an anodic plateau at ∼ 30μAcm−2 attributable magnesium depletion for alloy surface formation protective film. Chemical analysis electrolyte as function dissolution time rapidly solidified material indicated initially only dissolved this ceased within 2 5 min. results indicate aluminium-enriched interdiffusion zone underlying more stable oxide than ingot-processed Mg-Al-based alloys.