The Effect of APplied Voltage on PEO Coatings on Aluminized Steel

Due to the formation of porous oxide on the steel surface it can't directly use by PEO procedure. Therefore, in this research, hot diPping process (at ۷۵۰°C and ۵ min) was used to deposit Al coating on steel substrate. Plasma electrolytic oxidation (PEO) was aPplied on the obtained aluminized coating to measure its resistance to corrosion attack. SEM was used to evaluate the microstructure of PEO coatings deposited on aluminized steel by different aPplied Voltages. XRD was also used to analyze the phases on PEO coatings generated by aPplied different Voltages. Corrosion behavior of the coatings was also investigated using polarization tests in ۳.۵% NaCl solution. Results in indicated that the coated samples prepared at ۴۰۰ Volts developed a coatings with porosity of  about ۴.۸۶% and a thickness of  ۳۰ μm had a corrosion current density of ۲.۸۸ ×۱۰-۸ A/cm۲  which in comparison to that of coated samples produced at Voltages of ۳۵۰ and ۴۵۰ Volts with corrosion current densities of ۱.۰۴×۱۰-۷ A/cm۲ and  ۲.۱۸×۱۰-۷ A/cm۲  respectively showed an improvement of ۱.۹۸ to ۲.۵ times in corrosion resistance

کلیدواژه ها:

Hot diPping ، Aluminized steel ، Plasma electrolytic oxidation ، Corrosion resistance ، غوطه وری گرم ، فولاد آلومینایز شده ، اکسیداسیون الکترولیتی پلاسمایی ، مقاومت به خوردگی