عنوان مقاله [English]
In this research alumina sol-gel coating was applied on St44 steel by dipping, that sintered at temperatures of 300, 400 and 500˚С after drying. Phase and micro structure analysis, corrosion resistance, adhesive strength and wear resistance were evaluated by XRD, SEM, electrochemical tests in 3.5% NaCl solution, pull off test and wear tester respectively. The results of DTA and XRD indicate that coating structure was amorphous at sintering temperature of 300˚С and transformed to γ-Al2O3 completely at 500˚С and transformed to α-Al2O3 completely up to 1200˚С. Microscopic observation indicate minimum defects and maximum compaction for interface of sample sintered at 400˚С. The best wear and corrosion resistance obtained at 400˚С and the decrease properties of sample sintered at 500˚С could be due to cracks and holes caused by the phase transformation from amorphous to crystalline structure.