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Biomedical coatings on magnesium alloys - a review.

Plasma electrolytic oxidation of magnesium and its alloys: Mechanism, properties and applications

Corrosion behavior of equal-channel-angular-pressed pure magnesium in NaCl aqueous solution

Corrosion of AZ91D magnesium alloy with a chemical conversion coating and electroless nickel layer

The corrosion susceptibility of Mg and its alloys in humid and aqueous environments limits their widespread application. The performance of several conversion coating technologies is reviewed herein. In addition to the assessment of performance based on the literature to date, thermodynamic analysis has been used to compare coating processes. Ongoing research reveals that the search for appropriate conversion coatings to replace toxic Cr-based coatings continues. It is seen that the variability between coatings of the same technology was greater than the averages between coating technologies. Additionally, coating pretreatment also appears to be more significant than the choice of coating technology itself.

Review of Corrosion-Resistant Conversion Coatings for Magnesium and Its Alloys

The method for preparing anticorrosion wear-resistant clading layer for magnesium and its alloy Said method includes pretreatment and chemical nickel plating process It is characterized by that itspretreatment process includes the steps of alkali washing, alkali eathching and activation in turn, in which the solution composition for alkali eatching includes 40-60 g/L of pyrophosphate, 10-20 g/L of nitrate and 10-20 g/L of carbonate, its treatment temp is at 60-80 degC, time is 5-15 min, moderately stirring; and the solution composition for activating includes HF 80-150 ml/L and ZnO 25-50 g/L, and activating time is 5-10 min at 20-40 degc, and moderately stirring

Method for preparing corrosion-resisting wearing-resisting coat used for magnesium and alloy thereof

A nickel-phosphor coating was prepared on the surface of AZ91D magnesium alloy by electroless plating.The coating was so uniform and dense that it had no obvious surface defects.The structure of the coating was single phase (Ni) by X-ray diffraction and the adhesion was good by quenching.By dynamic potential polarization,it was shown that the free corrosion potential of the coating approached -0.4 V(SCE) and it had evident passivation.The coating had better corrosion resistance than the substrate,and had extensive application prospect.

Hongwei Huo

Papers

Corrosion of AZ91D magnesium alloy with a chemical conversion coating and electroless nickel layer

Method for preparing corrosion-resisting wearing-resisting coat used for magnesium and alloy thereof

Electroless nickel plating on az91d magnesium alloy