Corrosion Monitoring of PEO-Pretreated Magnesium Alloys
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The MA8 alloy (formula Mg–Mn–Се) has been shown to have greater corrosion stability than the VMD10magnesium alloy (formula Mg–Zn–Zr–Y) in chloride-containing solutions by Scanning Vibrating ElectrodeTechnique (SVET) and by optical microscopy, gravimetry, and volumetry. It has been established that thecrucial factor for the corrosion activity of these samples is the occurrence of microgalvanic coupling atthe sample surface. The peculiarities of the kinetics and mechanism of the corrosion in the local heterogeneousregions of the magnesium alloy surface were investigated by localized electrochemical techniques. The stagesof the corrosion process in artificial defects in the coating obtained by plasma electrolytic oxidation (PEO)at the surface of the MA8 magnesium alloy were also studied. The analysis of the experimental data enabledus to determine that the corrosion process in the defect zone develops predominantly at the magnesium/coatinginterface. Based on the measurements of the corrosion rate of the samples with PEO and compositepolymer-containing coatings, the best anticorrosion properties were displayed by the compositepolymer-containing coatings.
Abstract
The MA8 alloy (formula Mg–Mn–Се) has been shown to have greater corrosion stability than the VMD10magnesium alloy (formula Mg–Zn–Zr–Y) in chloride-containing solutions by Scanning Vibrating ElectrodeTechnique (SVET) and by optical microscopy, gravimetry, and volumetry. It has been established that thecrucial factor for the corrosion activity of these samples is the occurrence of microgalvanic coupling atthe sample surface. The peculiarities of the kinetics and mechanism of the corrosion in the local heterogeneousregions of the magnesium alloy surface were investigated by localized electrochemical techniques. The stagesof the corrosion process in artificial defects in the coating obtained by plasma electrolytic oxidation (PEO)at the surface of the MA8 magnesium alloy were also studied. The analysis of the experimental data enabledus to determine that the corrosion process in the defect zone develops predominantly at the magnesium/coatinginterface. Based on the measurements of the corrosion rate of the samples with PEO and compositepolymer-containing coatings, the best anticorrosion properties were displayed by the compositepolymer-containing coatings.
참고문헌 (12)
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