Nigrit “M-Extra”
• Etching ink, black pickling and cold burnishing agent
• Liquid medium on acid basis
• Especially for copper, tin, zinc, special copper alloys and for special alloys of copper and steel
Pictures may differ from the original.
Packaging units:
| Application area: | COLD BURNISHING - BLACKENING for copper, tin, zinc, special copper alloys and for special alloys of copper and steel |
| 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 necessary prerequisite for uniform blackening . - Depending on the material, blackening occurs relatively quickly (approx. 1 - 5 sec. after application). If NIGRIT „M-Extra" remains too long on the component, loose oxides will accumulate on the surface, which have to be removed after the process (expediently with a root brush, or similar). If the blackening has not become sufficient, the burnishing process can be repeated after the material has been cleaned. - Here it has been found that more than two burnishing passes hardly show any significant improvement. If an irregular coloration is noticeable after burnishing, this is an indication of insufficient degreasing. |
Download product informationPDF (126 KB)
After removing loose oxides, which should be done in a neutralization bath with NEUTRASOL concentrate (EO Cat. No. 875), the workpiece should be dried and preserved.
Neutralization bath:
Normal tap water with our NEUTRASOL can be used to prepare the bath. The pH value must be checked constantly and should not fall below pH-10, otherwise the workpieces will start to rust. – Indicator paper is used for checking.
Preservation:
EO Aftertreatment Fluid, Cat. No.: 0871, is a temporarily effective, preservative metal protection for application after use of NIGRIT „M-Extra”. Corrosion phenomena are always undesirable, therefore the metal surface should be treated briefly with this fluid (thin application) after each use. Due to the water displacing additives, the contact between metal surface and remaining moisture is reliably prevented.
Questions about our products?
We will advise you by phone 06123 / 7046-0.
