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Affiliation of Author(s):材料科学工程学院
Teaching and Research Group:材料科学工程学院
Journal:Transactions of Nonferrous Metals Society of China
Funded by:其他课题
Key Words:electroless nickel-plating; die cast magnesium alloy; corrosion resistance; polarization
Abstract:Electroless nickel-plating on die cast magnesium alloy AZ91D was investigated. Growth of the electroless nickel-plating coating was characterized using scanning electron microscopy. Corrosion resistance of the coating was evaluated by open circuit potential and potentiodynamic polarization curves in 3.5% (mass fraction) NaCl solution. The results show that plating deposition is initiated on the crevices and then spread onto primary α phase. The corrosion potentials for die cast magnesium alloy AZ91D and nickel-plating coating are about −1.45 V and −0.36 V (vs. SCE), respectively. No discoloration, cracks, blisters, or peeling appear by heat-quench test. The results show that the corrosion potential of Ni-P coating is increased by 1 000 mV and corrosion resistance for die cast magnesium alloy AZ91D is improved. The adhesion between the coating and the substrate is excellent. Electroless nickel plating is a promising method to enhance magnesium alloys resistance for attacking.
First Author:Jia Suqiu
Indexed by:Journal paper
Issue:2007-S1
Page Number:2
Translation or Not:no
Date of Publication:2007-11-26