Chemical method for surface treatment in
powder metallurgy process is using interaction of chemical substances to form a
coating layer on the surface. This method is not current effect,. Its main
method is:
(1)
chemical
conversion treatment
In electrolyte solution, the interaction of
chemical substance and product make product surface form a coating, which is
called chemical conversion treatment. Such
as bluing, phosphating, passivation and chrome -pickle treatment.
(2) Chemical plating
In electrolyte solution, catalyzing product
surface without external current, as a result of chemical reduction, some
material was deposited on product’s surface to form coating, which is known as
chemical plating. such as chemical nickel plating, electroless copper plating
etc.
Original article link：
http://www.zcmim.com/article/powder-metallurgy-process-sttcm_1.html
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