Zinc has been used for more than 100 years as a protective coating, with electroplating as the most prevalent application method in which the chemical bath is electrically charged causing the zinc to adhere to the part. Zinc electroplated coatings protect the base material against corrosion by forming a protective barrier and acting as a sacrificial anode if the zinc becomes damaged.
Zinc phosphate is a crystalline conversion coating that is formed via chemical reaction between the plating bath and the metal substrate. It has numerous applications from base coatings for paint and rubber molding to inexpensive rust preventive coatings.
Calcium Modified Zinc Phosphate
Calcium Modified Zinc Phosphate coatings are typically used as a base for paint, rubber bonding, corrosion protection or break-in lubrication. The built-in grain refiner helps to form a smooth, uniform, microcrystalline structure. Calcium modified zinc phosphate coating weights can range from 150-1100 mg/ft2 depending on the formula chosen and the method of application.
Pickling is a metal surface treatment used to remove impurities such as stains, rust, or scale from ferrous metals. Parts are dipped in a solution which contains strong acids used to remove the surface impurities.
Vibratory deburring is a type of mass finishing process used to remove burrs, descale, burnish, clean, and brighten parts to prepare for further processing.
Burrs are most commonly created after manufacturing operations, such as stamping, machining, drilling, coining, turning, etc. These burrs are usually detrimental to the function of the part and must be reduced or removed.
In this batch-type automated operation, parts are tumbled against each other in either a part-on part process or mixed with specially shaped pellets of media.
The vibratory bowl and all of its contents are then vibrated, causing grinding contact between the surface of the parts and the media, which yields the desired result.
Considerations for specifying vibratory deburring are dependant on the part application, amount and type of burrs, and the required result, etc.
Manganese phosphate coating has the highest hardness and superior corrosion and wear resistances of general phosphate coatings.
It is extensively employed to improve the sliding properties of engine, gear, and power transmission systems.
It can be found in virtually all branches of the metal working industry.