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The development of a conversion coating in a stannate bath on magnesium-based ZC71 alloy and on a metal matrix composite (MMC), comprising a ZC71 alloy matrix and 12 vol% SiC particles, has been studied using weight gain behaviour, measurements of corrosion potential, X-ray diffraction and microscopic examination. The coating, typically 2-3 μm thick, is composed largely of crystalline MgSnO 3...