Tough Finishes for Steel & Iron

Remote Controls, Inc can help preserve the quality and durability of your iron and steel parts by adding our black oxide and phosphate coatings. These finishes will help prevent corrosion and wear on your metal parts.

Black Oxide Coating

The black oxide coating comes about through a chemical reaction between the ferrous material’s iron content and the oxidization salts in the process solution producing a magnetite (Fe3O4) finish on the part. Oil is then applied to the heated part, which seals it by "sinking" into the applied porous layer. It is the oil that prevents the corrosion of the workpiece. The advantages of black oxide are:

• Blackening can be done in large batches (ideal for small parts),
• No significant dimensional impact (the blacking process creates a layer about a micrometer thick),
•It is far cheaper than similar corrosion protection systems, such as paint and electroplating.

Specifications & Certifications

The formation and properties of Black Oxide finishes are described in the controlling documents AMS-2485 and MIL-DTL-13924, plus various Customer specifications.

Phosphate Coatings

We offer both Manganese and Zinc Phosphate coatings. Formed by a chemical reaction between the process solution and the iron surface, these coatings are prescribed as a pretreatment for paints, for corrosion resistance, and as a "break-in" barrier on hardened and close fitting surfaces.

Specifications & Certifications

The formation and properties of Phosphate finishes are described in the controlling document MIL-DTL-16232, plus various Customer specifications.

We no longer provide certification of MIL-DTL-16232 without prior contract or pre-production inspection approval.

Passivation of Stainless Steel

Passivation (aka Immunize) is a treatment of Stainless Steel surfaces to (a) remove traces of free iron and (b) produce a PASSIVE or IMMUNE barrier that inhibits and retards corrosion. Remote Controls, Inc. offers both “NITRIC ACID” and "CITRIC ACID” Passivation processes. "Citric Passivation" provides equal to superior passivation while being vastly less dangerous and environmentally harmful than the conventional nitric based processes. Contact us for information on capacity and cost.

Specifications & Certifications

The formation and properties of Passivation finishes are described in the controlling documents ASTM-A-967 and AMS 2700, plus various Customer specifications.