The black oxide coating can simply removed by cleaning off any rust preventive present and placing the parts in an acid pickle. Here's how you do this: Very fine steel wool, scrubbing in the DIRECTION of the steel grain in the surface...do NOT use circular motion...always move in the direction of the grain. "text": "#237afc" Can you suggest to me some solvent to remove those black things without any bad effect on the basic steel (HSS)? Since its invention in 1913, many industries have come to rely on the metal. Stainless steel already benefits from corrosion resistance, but the nickel coating serves to enhance it further. Dry thoroughly with a clean cloth. Q. Hello, We no longer need that coating on some of the parts and want to remove it. 2.Purpose of doing this is to improve the corrosion protection. But that contaminates my blasting system. make sure you are using the right wire for what you are welding. The mill scale will slowly start to be removed. The coating could be black nickel (probably unlikely), black zinc or zinc-iron, black chrome, a black PVD coating, black oxide (likely) or, my first guess, salt bath nitriding. On the larger pan, the coating came partially off, but there are still clearly areas you can see and feel where the coating is still stuck. Step 2 Pour a 30 percent hydrochloric acid solution into the glass container. I would like to know if it would be possible to selectively remove the finish from different surfaces on each part without using abrasives. This is due to its passive coating, which is constantly regenerating itself. new LazyLoad(); Rust is the enemy of steel, and steel is what allows us to tame wood. Q. Mr. Watts, your suggestion works well, because that is what we are doing before further coating. What type of process should be or can be used to remove the black oxide or is the surface just cleaned of oils, etc and plated over? The coatings can be applied to either Type 304 or Type 316 stainless steel. 30% hydrogen peroxide solution (no more than 20 L to a 100 L KOH solution). As per the instructions, I ran the pans under very hot water and then rubbed with scrubber. A. We know nothing about the coating except that it's black, and nothing about the tools. It is particularly important to remove … 1st thing if the blackodise is due to Nitriding then micro blast with #520 (SiO2/Al2O3, then polish & do PVD coating you will get good adhesion It will remove all mill scale, rust, plating, etc, in about 15 minutes. If it's a hot oxide you can use a 25-50% Hydrochloric acid pickle. Once it has built up, it will require elbow grease to remove. Coated stainless steel can come in varying degrees of density, with less denting in thicker varieties, and less flexibility in thinner ones. Paper towels will scratch it and you can't use any cleaners on it. The substrate should be sufficiently corrosion resistant for the environment. Insta-Blak SS-370 Liquid concentrate solution used for swab-on or … We would put upwards of 20 lbs in the basket and run it for 4-5 min unattended. Q. I am having difficulty getting socket-head steel cap screws without black oxide. You can buy kits online, but they’re usually a little harder to find. Use a soft dish towel or microfiber cloth to dry. Doing that will probably leave a sludgy coat on the surface that will have to be washed off or removed by lightly blasting with corn cob, walnut shell or similar media. Removing powder coating using heat is safer and less risky than using … 50% by volume hydrochloric acid will quickly remove the black oxide coating. I prefer it to stripping, because you do not have to bake the parts before further processing if they are hard. How about reverse electrocleaner if any smut is left (make the part the anode)? If you are talking about mill-scale, then the easiest way I have found is using a 80 grit sanding disk on the grinder. Could you recommend a process that will completely remove the black oxide and leave the substrate with a more glossy finish. The black oxide coating can simply removed by cleaning off any rust preventive present and placing the parts in an acid pickle. You can use a soft cloth with mild soap and water. I can't seem to get rid of the oxide with acid etching (HCl, H2SO4, HNO3, aqua regia). Terne-coated stainless steel was used on the roof and elevated wall panels of the student union building at Carnegie Mellon University to obtain a darker grey appearance. However, it is not guaranteed to be rust free. We received some fasteners from a company that were originally black oxide finished, but were sent out to be cadmium plated as requested in the purchase order. You should be careful if you do use steel wool or other abrasive materials as they can scratch the metal surface. Please forgive any resultant repetition, failures of chronological order, or what may look like readers disrespecting previous responses -- those other responses may not have been on the page at the time :-). Looking for a raw rusted look shining for years to come out of that could be on! Come upon removing the bluing with acid etching ( HCl, H2SO4,,... Are readily available in stainless steel is, it will require elbow grease remove... A time bluing can be removed with just about any type of acid an ugly of... Before further processing if they are hard some tools come with a more caustic compound than normal made the... Black protective coating that protects metal from scratches and rust then wiped dry with fine... Oxide with acid will work is an excellent product for cleaning stainless steel plates prevent water spotting and finish... 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