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Two processes for chemically treating flange surfaces
Feb 11, 2019

There are two main processes for chemical treatment of flange surface:

One is the high temperature oxidation (is often said the hair orchid);

The second is room temperature blackening.

The main materials for high temperature orchid are sodium hydroxide and sodium nitrite.Room temperature blackening with a special blackening agent, the main blackening ingredients are copper ions and selenite.