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Mid-Temperature Black Oxide

Like hot black oxide, mid-temperature black oxide converts the surface of the metal to magnetite (Fe3O4). Yet mid-temperature black oxide blackens at a temperature of 220–245 °F (104–118 °C), significantly less than hot black oxide. This is advantageous because it is below the solution's boiling point, meaning there are no caustic fumes produced.

Since mid-temperature black oxide is most comparable to hot black oxide, it also can meet the military specification MIL-DTL-13924, as well as AMS 2485.

Cold Black Oxide

Cold black oxide is applied at room temperature. It is not an oxide conversion coating, but rather a deposited copper selenium compound. Cold black oxide offers higher productivity and is convenient for in-house blackening. This coating produces a similar color to the one the oxide conversion does, but tends to rub off easily and offers less abrasion resistance.

Corrosion Resistance

The application of oil, wax, or lacquer brings the corrosion resistance up to par with the hot and mid-temperature. One application for cold black oxide process would be in tooling and architectural finishing on steel (patina for steel). It is also known as cold bluing.

Shipment Details:

Preferred: EXW, FOB, CIF, CFR

We prefer to have the export clearance process operated by ourselves since normally we deal with China’s customs more than most clients do. Not to mention the tax rebating procedure can be more or less simplified if we clear the custom on our own.

For any other set of shipping terms especially that where export clearance isn’t our part to deal with, please talk to us for further detail negotiation, just to avoid any discordance.

Our first priority had always been to offer quotation with EXW(China) terms applied prices. However for final shipment decision the other 3 sets of shipping terms are also recommended.