Phosphate Coatings and Manganese Zinc Coatings

Phosphate coatings are crystal conversions that is formed on ferrous metals as substrates. This is a method beneficial as a pre-treatment process prior to an additional coating or even before painting. Not only that phosphate coating increases the protection of metal substrates from corrosion, this also gives more like lessening friction properties and improving sliding components. Other times, this process is done to threaded parts plus oils to also prevent galling and rust. 

 

What happens when the phosphate coatings solution gets in contact with a metal substrate is the pickling reaction. This reaction promotes strong adhesion and protection from corrosion. Usually, this process is used in hard steel parts but at times also on aluminum.

 

Phosphating has two kinds; type M and type Z. The first is Manganese coating, this process is basic of phosphate coating using manganese. There are a lot of advantages in using manganese phosphates. This type of coating is the hardest of its classification. It protects metal or aluminum substrates from corrosion, galling and promotes lubricity. Coming from that perspective, you can then conclude that this is very important to the automotive industry; yes it definitely is. It provides unbeatable corrosion and abrasion protection as well as priceless durability. Manganese coatings actually also offer continued protection after some components break inside a substrate that are prone to wear. Manganese coatings are the type that are only applied through immersion or bathing. There are a lot of usage that come from manganese coatings like bearings, fasteners and a lot more others that are common industrial products. However, it is most common in projects that require sliding of parts such as automotive and transmissions. 

 

Moving onto the second one which Zinc coatings. This is mainly used for rust proofing metal substrates. This is the convenient way of avoiding the corroding properties of rust get the best of your metal materials. There are two man ways of doing zinc coating and they are either by spraying or immersion. Either way, Zinc coating provides the same rust protection. It may not be as hard as manganese, yet still provides corrosion protection. This metal can also be in a calcium modified zinc type where it can then also provide anti-galling properties. Most commonly thought is used as a pre-treatment process to protect metal substrates from corrosion with either for another coating or maybe a before applying paint. Zinc phosphate also comes in a wide range of coating weights ad crystal sizes. It actually depends on the weights and sizes of crystals of what will its purpose be. It can be a base for paint, a coat for corrosion resistance or even to help cold forming process. 

 

There are many factors to consider when you are going to choose what type of zinc coating to use. Aside from corrosion protection you might also want to think of formability, adherence, appearance and practically the overall cost. These factors are the ones you should consider for you to be guided on what type of zinc coating you should choose.