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Review on the phosphate-based conversion coatings of magnesium and its alloys

International Journal of Minerals,Metallurgy and Materials 2022年第7期29卷 1435-1452页

作者： Debasis Saran Atul Kumar Sivaiah Bathula David Klaumünzer Kisor K Sahu School of Minerals Metallurgical and Materials EngineeringIndian Institute of Technology BhubaneswarBhubaneswar 752050India Group Innovation(COI Battery-Metals) Volkswagen AGWolfsburg 38440Germany Virtual and Augmented Reality Centre of Excellence(VARCOE) Indian Institute of Technology BhubaneswarBhubaneswar 752050India

Magnesium(Mg)and its alloys are lightweight as well as biocompatible and possess a high strength-to-weight ratio,making them suitable for many industries,including aerospace,automobile,and *** major challenge is their high susceptibility to corrosion,thereby limiting their *** considerably lower reduction potential of Mg compared to other metals makes it vulnerable to galvanic *** oxide layer on Mg offers little corrosion resistance because of its high porosity,inhomogeneity,and *** conversion coatings(CCs)belong to a distinct class because of underlying chemical reactions,which are fundamentally different from other types of ***,a CC acts as an intermediate sandwich layer between the base metal and an aesthetic *** chromate CCs offer superior performance compared to phosphate CCs,yet still they release carcinogenic hexavalent chromium ions(Cr^(6+));therefore,their use is prohibited in most European nations under the Registration,Evaluation,Authorization and Restriction of Chemicals legislation ***-based CCs are a cost-effective and environment-friendly ***,this review primarily focuses on different types of phosphate-based CCs,such as zinc,calcium,Mg,vanadium,manganese,and *** discusses their mechanisms,current status,pretreatment practices,and the influence of various parameters-such as pH,temperature,immersion time,and bath composition-on the coating *** challenges associated with phosphate CCs and future research directions are also elaborated.

关键词： phosphate conversion coatings magnesium alloys corrosion zinc phosphate conversion coatings calcium phosphate conversion coatings magnesium phosphate conversion coatings

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