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학술저널
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한국부식방식학회 Corrosion Science and Technology Corrosion Science and Technology 제18권 제5호
발행연도
2019.1
수록면
182 - 189 (8page)

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A thin spray coating of inorganic black lithium polysilicate (IBLP) on black anodized AZ31B magnesiumalloy was fabricated for better corrosion resistance and thermo-optical properties for thermal control of spacecraftcomponents. The morphology of the specimens with and without IBLP-based spray coating was characterizedby SEM-EDS techniques. Impedance and potentiodynamic measurements on the specimens revealed bettercorrosion resistance for the specimen with a thin coating of lithium polysilicate. This was primarily dueto the presence of lithium polysilicate inside the micro-cracks of the black anodized specimen, restrictingthe diffusion paths for corrosive media. Environmental tests, namely, humidity, thermal cycling, thermovacuum performance, were used to evaluate the space-worthiness of the coating. The thermo-optical propertiesof the coating were measured before and after each environmental test to ascertain its stability. The specimenwith an IBLP-based spray coating showed enhanced thermo-optical properties, greater than ~0.90. Hence,the proposed coating demonstrated better handling, better corrosion resistance, and space-worthiness duringthe pre-launch phase owing to its improved thermo-optical properties.

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