Investigation of Corrosion Resistance of Magnesium Alloy AZ91 Immersed in Sodium Chloride Solution at Various Concentrations Utilizing the Linear Polarization Method
Keywords:
Calculate Corrosion Rates, Coated Samples, Magnesium Alloy, AZ91 Magnesium, Corrosion Resistance, Surface TreatmentAbstract
When using the linear polarization method to calculate corrosion rates for coated and uncoated samples. Tafel plot experiments were used to calculate the values of βa and ßc used in estimating the wear rate.
It was found that in uncoated and coated samples, the corrosion rate increases with increasing sodium chloride concentration. However, in the case of uncoated specimens, the increase in wear rate is more pronounced.
According to the most recent findings, applying surface treatment while sodium stagnate solution is present significantly improves the AZ91 magnesium alloy's capacity to withstand corrosion. For instance, the CRs for the coated and uncoated samples are 122 mpy and 81.4 mpy, respectively, at 7 percent NaCl. Electrochemical testing shows that the surface treatment improves corrosion resistance by 33.3 percent and lowers corrosion rate by 33.3 percent.
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