BLACKING OF STAINLESS STEEL BY GALVANIZING
Description
Black galvanizing is one of the options for giving stainless steel a black color. Additional protection against corrosion is provided only mechanically (barrier) and in environments where zinc itself is stable. In general, zinc coating is inferior in corrosion resistance to the base metal. Blackening of stainless steel is possible either with oiling (more “greasy” surface, better protection and wear resistance), or with filling in a water-oil emulsion or polymer composition (less “greasy” surface, more aesthetic appearance). Mechanically, the black chromate layer on zinc is relatively weak under strong friction. You can order galvanizing of stainless steel with black chromating according to GOST 9.305-84 by phone and email indicated in the section "CONTACTS".
Characteristics
|
Designation (examples) |
Zn |
|
Thickness |
6-50 microns (optimal, greater thickness is possible) |
|
Microhardness |
490-1180 MPa |
|
Electrical resistivity at 18° C |
5.75×10-8 Ohm⋅m |
|
Permissible operating temperature |
300° C |
Advantages:
- Deep black color.
- Small additional protection against corrosion mechanically, by isolating the surface from the corrosive environment. Possibility of adjusting the thickness of the coating.
Disadvantages of galvanizing:
- Comparatively low wear resistance compared to black chrome plating.
- Usually requires oiling.
Read also articles
Galvanizing mechanism
Description of the galvanic galvanizing process. Electrolytes.
Hydrogenation and removal of hydrogenation of steel after galvanizing
The problem of hydrogenation during galvanizing. How to dehydrate?
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