Black Oxide

   We have a room temperature, environmentally friendly black oxide coating for zinc surfaces and working on other substrate materials. At this point, the black oxide coatings are used in conjunction with silicate based  ("zero Chrome") corrosion protection coatings  when there is need for black finish.  

CHEMIONIC is in the process of evaluating the new black oxide process on zinc (stand alone) to compare against high temperature and chemically aggressive black oxide coatings.  We can provide R&D service now and can manufacture small parts.  

     CHEMIONIC  can provide R&D support for other substrates also.

         Operating at high solution temperature, steel blackening processes are not the most pleasant things to be around.  In order to reduce the hazards of hot blackening, and to save energy, proprietary cold blackening solutions have been developed.  They are operated at room temperature and are based on different chemistries, so they are substantially less hazardous.  Room temperatures blackening are not a true black oxide process.  Rather it involves the application of a copper-selenium compound.  This compound is not an acceptable substitute for black oxide, as it does not look as durable as the one obtained with the hot blackening process.  a recent article in December AESF issue, compound-layer blackening of steel at room temperatures.  But it is a compound layer, which consists of a phosphate coating and a blackening coating, formed separately in a two-step operation and there are several chemicals used in both processes. 

Back to Contract R&D page

Send mail to ravi.chandran@chemionic.com with questions or comments about this web site.