Abstract
Abstract Phase constitution of the iron (Fe)-aluminum (Al) alloy layer and corrosion behavior of the welding zone of Al-coated steel in saturated hydrogen sulfide (H2S) solution were studied using a metalloscope, scanning electron microscope, and x-ray diffractometer. H2S was generated by reacting sulfuric acid (H2SO4) solution and saturated sodium sulfide (Na2S) solution. The Fe-Al alloy layer was composed mainly of δ-Fe(Al) solid solution, Fe3Al, and FeAl. There were no brittle FeAl2, Fe2Al5, or FeAl3 phases in the Fe-Al alloy layer. Pitting attack occurred in the Fe-Al alloy layer in the heat-affected zone (HAZ), while electrochemical attack was concentrated in the fusion zone.
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