Black Oxide Coating Problems

Please go to our directory of jobshops and search for the term black oxide.

Black oxide coating problems.

The finish should be oily black. One of its advantages over other coatings is. The reaction between the iron of the ferrous alloy and the hot oxide bath produces a magnitite fe3 o4 on the actual surface of the part. Avoiding excessive sludge and chemical buildup.

A problem solving guide for black oxide coatings that s the direction this article is taking. Many jobshops offer black oxide services. We use a high temperature black oxide to finish a number of different tools a couple of these tools have joints with a tight fit. As advantageous as this supplementary feature undoubtedly is black oxide failure does occur so we need to stay abreast of the common problems incurred by this oxidizing process.

Achieving a cleaner deeper black finish. Only the inspector s pen is wavering. Putting a tick in that checkbox the coating should also be moderately corrosion resistant. Assessing process variables as with any high end engineering process numerous variables are at work during a black oxide coating sequence.

To achieve maximal corrosion resistance the black oxide must be impregnated with oil or wax. If the residue is sodium or potassium salts it is likely that it came from the black oxide process. Control buildup of sludge red iron oxide zinc. It is used to add mild corrosion resistance for appearance and to minimize light reflection.

There s an issue with the ebony hued conversion coating. The black oxide process is a chemical conversion coating. The tools are thoroughly rinsed and soaked in hot water an extended period of time. Curtis you could confirm the source of the white residue by carefully scraping some of it off the parts and analyzing it.

563 south leonard street waterbury ct 06708 1 203 756 5521 1 203 756 9017 contact us online p o. Black oxide is a conversion coating formed by a chemical reaction produced when parts are immersed in the alkaline aqueous salt solution operated at approximately 285 degrees f. Aluminum and copper in ultra blak 400 baths or other black oxide solutions. Solving iron copper and zinc contamination problems.

Instead the black oxide coating is produced by a chemical reaction between the iron on the surface of the ferrous metal and the oxidizing salts present in the black oxide. Black oxide hi temp application. Black oxide or blackening is a conversion coating for ferrous materials stainless steel copper and copper based alloys zinc powdered metals and silver solder. Where to get it done.

We find that 30 40 of the tools show salt bleed out at the joints.