1、Brife:
Manganese Series Phosphating can form a type of crystalline lens of phosphating film in the surface of Steel and iron. This type of phosphating film can improve the wear resistance and corrosion resistance of the parts. HK575 phosphating film has strong adsorptivity, and High wear resistance when soaked with suitable oil during part working.This process is widely used in automobile engines,Diesel engines and parts in aerospace industry. Usually, one kilo of HK575 can used for 11m2 surface.
2、Technological process
Oil Removing—— Wash (overflow)—— Rust Removal —— Wash (overflow)——Pre-dips（6‰ tank）——Phosphating（80-90°C）——Wash (overflow) ——Hot dry——Anti-rust Oil Treatment
3、Phosphating method
HK-M-575 Manganese Series Phosphating
4、Method of Application
a、Tank liquor Solution
- Add 3/4 Volume of Water into tank
- Add 9-10%(volumeratio) HK-575;(140kg/1000 litre)
- Add water till Work level, and Turn up the heat to 80-90°C
- Add 2Kg/1000 litre of the iron fuse, to keep it reacting for one hour, then used for phosphating
b、Phosphating tank ingredient
Mn2+, No3-， H2PO4， H3PO4 and ther additives.
Composition of Phosphating Film: （Mn，Fe）5H2(PO4)4·4H2O.
c、Operating Conditions
Concentration： 9-10%（ volume ratio）
Temperature：80-90°C
Time： 10-20Minitues
Free acid： 10-12ML
Total acid ： 60-70ML
5、Formed Phosphating Film thickness: 2um
6、Inspection methods : Cupric sulfate drop method
Ingredient : CuSO4· 5H2O 41g/L, NaCl 35 g/L , 0.1 MoL/L HCl, and water
Qualified: Time period more than 180s.