1、Sort of Soluble emulsifier ,therefore environment-protective and safe;
2、The production goes on with heat-treating guipure furnace ，thus forming a highly efficient and economic production network.;
3、After nigrescent treatment ,the workpieces takes on good luser and carries strong performance of anticorrosion and rust protection.
4、If reduces labour intensity and improves invironment;
5、Acid picking is not needed before the nigrescent treatment while hydropeening can be omitted arter that ;no emission of waste water ,gas and industrial residue;
No hydrogen embrittlement on the nigrescent-treated workpieces.
1.Steel nigrescence agent is condensed Stir and make 10& nigrescence agent fully mixed with 90% water before it becomes workable lotion.
2.Heat the stainless parts to 200-560℃ and it turns to black as soon as it is dipped into mixture of nigrescence lotion.
3.Package and oil the parts after they are dried with the heat of 120-180 ℃ out of the lotion.
4.Keep the nigrescence agent at the temperature of 40-60℃.It will pollute the transmission devices if overheated.
5.Add nigrescence agent according to output.