Surface engineering treatments

Blackening produces a uniform deep black surface layer on components made from ferrous materials. This makes them not only more attractive to look at but more resistant to corrosion.

Parts which can be blackened are: tools such as drill bits, milling tools, clamping jaws, drill chuck sleeves, screws, spindles, plain washers, small metal fittings, operating elements in the precision mechanics industry. Durferrit supplies products for blackening, and the pre and post treatments.

Products	Applications	Working temp.
FERROBLACK MH FERROBLACK OT	Contains special active ingredients for a wide range of applications.	approx. 140° C
FERROBLACK SPEZIAL / FERROBLACK PLUS	Ideal for blackening silicon steels and cast iron.	approx. 140° C
FERROBLACK HL	Particularly suitable for extra blackening of brazed joints.	approx. 140° C
FERROBLACK NIF	Nitrite-free salt for operatinga bath very low in nitrites.	approx. 140° C
FERROSOL / FERROSOL HL	A booster salt for all blackening baths for easier colouring of work pieces heat treated in cyanide- bearing salt baths or those with copper drawn layers.
STREICH-BRÜNIERBEIZE	A liquid product for brushing on or immersion at room temperature. Ideal for repairs and hobby work.	room temperature
BEIZENTFETTER	For descaling and partial degreasing prior to blackening.	room temperature
Durferrit G 19, G22	Alkaline hot degreasing prior to blackening.	60° - 80° C
KALTOL	For dewatering the blackened and washed work pieces at room temperature. Provides temporary protection against corrosion.
AUSKOCHÖL	For dewatering the blackened 100 - 110 °C and washed work pieces. This oil boils out the water in oil and neutralizes residual alkalis at the same time.	100° - 110° C

 
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