Preliminary study on one-step zinc dipping process with electrochemical assistance

Study on zinc dipping solution composed of double complexing agents for magnesium-lithium alloy

A new technology of zinc dipping for aluminum materials was introduced.

Oxide can be removed effectively after activation in the solution of H_3PO_4+NH_4HF,while adhesion ability of latter zinc immersion coating to substrate can be enhanced.

Zinc-immersed coatings were prepared on AZ91D magnesium alloy substrates using zinc immersion processes of zinc alone,binary Zn-Fe,Zn-Ni,Zn-Co,and Zn-Cu,and ternary Zn-Ni-Fe,aiming at improving the adhesion to substrate and cor-rosion resistance of follow-up electroless or electroplated coat-ings.

The quality of nickel deposit is an important indicator to test the performance of cyanide-free zincating solution for high-Si aluminum alloy.

Pre-treatment of aluminium surface for Ni-Fe plating including solutions for alkaline etching, pickling, zincating, activating and properties of the deposit obtained on 6063.

In order to substitute the cyanide complexing agent in the zincation solution,based on a lot of study on different complexing agent combinations,4 better cyanide-free zincation solutions are selected to compare with commercial cyanide-contained zincation solution for their performances,including micromorphology,components of the zinc deposit and the surface morphology and cor.