The new TRU TEMP® Stainless black oxide finishing process is used as part of a two-stage chemical reaction, beginning with an activation step with a dilute muriatic acid solution. The stainless-steel surface is then oxidized to form the uniform black coating that can be sealed with an appropriate rust preventive topcoat for optimum appearance and corrosion resistance.
TRU TEMP® Stainless Black Oxide for stainless steel forms a black magnetite finish when applied on stainless steel parts and is effective for finishing series 200, 300, 400 and 17-4 pH stainless steel. TRU TEMP® creates a protective black finish - 0.000020” (1 micron) thick, which has an attractive satin black appearance equal to that of hot black oxide.
Operating effectively at 200° to 210° F, TRU TEMP® Stainless finishes parts at much lower temperature than traditional hot black oxide that operates at 250-260° F. What’s more, is that TRU TEMP® Stainless uses zero chrome in the formulation unlike other competitive stainless finishes. Additionally, TRU TEMP® Stainless uses 30-40% less caustic content than other finishes, making TRU TEMP® a more user-friendly and environmentally friendly finishing option.
Finishing parts is fast and in the most common finishing line configuration completes the blackening in under an hour using a seven-step process which includes: clean, rinse, activation, rinse, blackening, rinse, and sealing. Alternate process designs, custom or automated finishing systems can be accommodated for most workflows.
TRU TEMP® Stainless finish makes it easy and fast to supply customers just-in-time requirements. By using an in-house finishing system, a company can achieve cycle time reductions, inventory reductions and overall process improvements. ISO accountability is enhanced and TRU TEMP® Stainless meets compliancy initiatives including MIL-DTL-13924 Class 4 compliant.
Birchwood Technologies provides free sample finishing for shops to evaluate
TRU TEMP® Stainless for their parts. Click here to request sample finishing authorization.