HAH provides phosphate coating on thread connections.

Phosphating (or phosphatizing) is a surface treatment used on steels to prevent corrosion, enhance the surface for other protective coatings, and improve lubricity. It involves creating a layer of crystal salts of iron and zinc or iron and manganese in a phosphoric acid solution.

The most common uses of phosphating relate to carbon steels, cast iron, and high- and low-strength alloy carbon steels.

Phosphatizing can be achieved by immersing the part in a bath or by spraying the part with the phosphating solution. A chemical reaction occurs, causing the zinc (or manganese) phosphate salts to adhere to the surface of the part.