2012•International Conference on Mechanic Automation and Control EngineeringRequires access

Microstructure and Hardness of Electroless Ni-La-P Coatings on 2024 Aluminum Alloys for Aircraft Structure

Chuanyong Huang

Abstract

the microstructure and hardness of electroless Ni-La-P alloy plating on 2024 aluminum alloys substrate in an alkaline plating bath with sodium hydrophosphite as reducing agent were investigated. The effects of LaNO3 concentration on the plating rate were studied. Microstructure and hardness of the electroless Ni-P and Ni-La-P deposits were compared. The results showed the deposition rate the electroless NiLa-P deposits increased in a range, and then decreased with the rise of the LaNO3 concentration. Scanning electron microscopy (SEM) of the deposits showed nodular structure for binary deposits. The hardness data indicated that electroless NiLa-P plating could obviously improve the hardness of 2024 aluminum alloy.

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Key concepts: Microstructure, Materials science, Alloy, Metallurgy, Scanning electron microscope, Plating (geology), Electroless plating, Aluminium