Etching ink, black pickling and burnishing agent, liquid medium on acid basis, for special steel alloys and high-alloy stainless steels
| Appearance: | green liquid |
Area of application
The solution supplied ready for use should be poured into a resistant container made of GRP, HDPE or PP.
Degreasing and inserting the parts
The parts to be blackened must be degreased before cold burnishing. In the simplest case, this can be done by washing with alcohol.
Blackening effect:
Thorough degreasing of the parts is a prerequisite for uniform blackening. Depending on the material (only a few seconds for ST 37), blackening occurs quickly. If “NIGRIT VA-Extra” remains on the workpiece too long, loose oxides will accumulate on the surface, which must be removed after the process (expediently with a scrubbing brush, or similar). If the blackening has not become sufficient, the burnishing process can be repeated after the material has been cleaned. It has turned out that more than two burnishing passes hardly show any significant improvement. If an irregular coloration can be seen after burnishing, this is an indication of insufficient degreasing.
