Some of the oldest examples appear in ancient Japanese swords. @sirhrmechanic . link to info/product on Amazon])- Operating temperature, 210 °F. Cold black oxide works on all ferrous materials except stainless steel. 1 rumble. Why Cold Blue or Black Oxide Coat Steel? Blackfast is a specialist finish for colouring iron and steel components black. There are several methods, but this one is easy and the only chemical required is used motor oil. A grey ferrous oxalate coating is applied to the steel and is then dyed black (similar to black anodizing of aluminum). A. Hi Terry. A friend gave me one just to try out for etching. Reactions: Mr. Zick. The oil burns off, leaving a deep black color that is fairly durable but that is subject to flaking which results in gray spots in the finish where the steel shows through. Oil blackening is part of the heat treatment process, and should NEVER be used on a part that is already heat treated. It is used to add mild corrosion resistance for appearance and to minimize light reflection. The Metal Finishing Guidebook lists 3 formulations of blackening baths for stainless steel. 4. Good luck, Bill Grayson - Santa Cruz, California, USA PX Member. It turned the steel black in a few seconds, and the black was a real pain to get off.Way to fast for etching but it sure leaves a blade black. However, the best results come from low carbon steels — cast and ductile iron and powdered metal. Here is the stuff applying to blackening steel. Looks kinda neat actually. If you know anyone in the welding business, get a jar of stainless steel pickeling gel. MK20 Major Member. Black Dyed Oxalate Finishing. At first a thin coating of oil was used to prevent corrosion in iron and steel, but eventually bluing processes were invented to provide much better protection. EPi’s mid-temperature black-oxide process, Kool-Blak 225, blackens steel in 30–45 minutes and converts it to black iron oxide magnetite, which provides a glossy black finish as well as protection for the part. It also has the US formula for browning gun barrels if anyone is interested. Blackening Steel With Used Motor Oil. It is a safe and easy-to-use chemical immersion process operated at room temperature. Mid-temperature blackening processes offer … Embed Share. Stainless will blacken does not require the oil, and the processing costs are similar to processing black oxide for steel. Report. Reply. Minuteman. Apr 17, 2018 1,722 2,388 … Rumble — Have you ever wondered how to get a beautiful black finish on iron or steel? Okay, so why bother coating steel with Cold Bluing or Black Oxide? It provides high quality blackening and corrosion resistance without utilizing hot solutions or EPA-regulated chemicals. The one that sounds simplest to me, although I can't comment on its efficacy, reads: - Sulfuric acid, 180 parts - Water, 200 parts - Potassium dichromate, 50 parts (Potassium Dichromate [affil. Other processes (black zinc, nickel etc..) are usually more expensive and alter the part dimensionally. ddrake Published January 28, 2019 527 Views. Subscribe Share. The product’s unique quality is that the finish does not result in an alteration to the dimension of the component. 1995. Black oxide or blackening is a conversion coating for various materials like stainless steel, copper and copper based alloys, zinc, powdered metals and silver solder.
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