Silver Black Finishes for Iron and Steel

What is MicroLok® AO?

An Attractive & Protective Finish for Iron & Steel – Without EPA Regulated Chemicals

The MicroLok® AO aluminum oxalate coating process is a new, unique metal coating option for iron and steel components. Applied at 120-140° F, the MicroLok® AO aluminum oxalate coating is a non-toxic conversion coating that is 0.000060" (1.5 microns) thick, silver-gray in color and tightly bonded to the substrate. When sealed with a rust preventive, the MicroLok® AO finish has excellent corrosion resistance and provides anti-galling protection and break-in lubricity to critical working surfaces. The process utilizes mild solutions and contains no EPA regulated chemicals; process rinse waters are generally sewerable as non-hazardous discharge.

MicroLok® AO serves as a direct replacement for room temperature copper/selenium-based blackeners or for zinc phosphate coatings, but without the heavy metal content and waste treatment requirements used for these processes.

MicroLok® AO aluminum oxalate coating is ideal for tooling and machine components, piston/cylinder assemblies, rotors & calipers, oil-field equipment or any part that does not require a dark black finish, but does require robust corrosion protection, anti-galling properties or break-in lubricity, without a dimensional change. The MicroLok® AO aluminum oxalate comes in a variety of sizer to suit your needs. Browse our options below!

MicroLok® AO Metal Coating

Silver/Black finish for Iron/Steel.
MicroLok AO


5 Gallon
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55 Gallon
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MicroLok® AO pH Adjuster

For use with MicroLok AO


5 Gallon
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