Microstructural development of galvanized steels prepared with Ni-P electroless deposited pre-coatings
Keywords:Galvanizing, Coatings, Electroless deposition, Ni-P alloys, Phase transformation
An electroless pre-coating process is investigated as a possible method to prevent the sandelin effect, whereby steels containing silicon reacts rapidly with zinc during galvanization. From the microstructural and kinetics analysis, it is found that nickel-phosphorus electroless pre-coatings effectively serve as barriers to the reaction between Fe and Zn during galvanization, regardless of the silicon content in the steel substrates. Correspondingly, the coating thickness of the galvanized steels can be well-controlled.
ASTM A153, Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware.
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