Birchwood Casey manufactures three coatings designed to provide corrosion protection for iron and steel components while improving appearance.
The Tru Temp black oxide process uses no EPA-regulated chemicals to produce a durable, satin black magnetite coating, 20 millionths (0.5 micron) thick, with no effect on material hardness or tensile strength, the company says. With an operating temperature of 200°F and a 30-minute blackening time, the process is designed to streamline workflow and lower costs. The finish is said to withstand as many as 100-200 hours of neutral salt spray or several hundred hours of humidity.
The company’s Presto Black cold blackening process operates at room temperature and uses mild, fume-free solutions designed to produce a uniform, non-dimensional black finish that absorbs a rust preventive topcoat and will not chip or peel. When configured with an ion exchange system to recycle the rinse waters, it operates as a completely self-contained, zero-discharge process line.
The Microlok AO process is designed for tooling and machine components that do not call for a black color but still require robust corrosion protection, break-in lubricity and galling resistance. The silver-black finish is a non-toxic, aluminum-oxide conversion coating, achieved using no EPA-regulated content. Process rinse waters are sewerable as non-hazardous discharge.