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Chrome Plating HVOF & Nickel Plating

Industrial Hard Chrome
Industrial chromium plating, also known as hard chrome or engineered chrome, is used to provide a working surface that requires one or more of the following characteristics: to reduce friction, add wear resistance, or increase corrosion resistance, as well as, chemical inertness, wetting or galling. It is very hard, measuring between 66 to 70 HRC. Hard chrome tends to be thicker than the decorative treatment, but thinner layers are not uncommon. Surface defects and roughness are amplified, because hard chrome does not have a leveling effect. While industrial hard chrome does provide an attractive finish, it is not to be confused with decorative chrome (such as might be applied to furniture, hub caps, exhaust pipes, etc.). Whereas decorative chrome is intended primarily to provide aesthetic appeal, industrial hard chrome is a rugged and durable plating designed specifically to resist corrosion and wear.

HVOF thermal spraying refers to the High Velocity Oxygen-Fuel (HVOF) thermal spraying process for generating a high-velocity flame derived from the theory of jet engine, where a powdery mixture containing metallic or ceramic particles is sprinkled into a flame and allowed to fly and collide with a target substrate to be laminated to form a coated film. Compared with other thermal spraying methods, the HVOF thermal spraying has the following general advantages:

(1) Its relatively low spray temperature prevents the process material from being degraded
(2) its supersonic velocity allows the work material to form a highly dense coated film.

The powdery material for thermal-spraying was designed to consist of one or more carbides and metals (binder) having
an adequate composition, formulating proportion, particle size and particle size distribution. By controlling the optimum thermal spraying conditions (oxygen/fuel ratio, thermal spraying distance, powder feeding rate, etc), a highly dense coated film was successfully formed. HVOF coating is harder than standard hard chrome has superior corrosion resistance and extends the length of seal life. Another great thing about HVOF coatings is that it is much better for the environment.

Electroless Nickle Plating
Electroless nickel plating is an auto-catalytic reaction used to deposit a coating of nickel on a substrate. Unlike electroplating, it is not necessary to pass an electric current through the solution to form a deposit. This plating technique is to prevent corrosion and wear. EN techniques can also be used to manufacture composite coatings by suspending powder in the bath.