Environmentally Friendly Metal Pretreatment Chemicals Cleaning Agent

Metal Pretreatment Chemicals Application

Be suitable for steelalluminiumzinccoppermagnesium work pieces in dipping and spray way.

Metal Pretreatment Chemicals Brief: JH1251 is a kind of degreasing agent with strong degreasing power for steelalluminiumzinccoppermagnesium work pieces in dipping and spray way. JH1251 is week base and free from phosphor.

Bath solution compound: Put cold water into the tank till three-quarter with appropriate degreasing agent, then stirring, after, add sufficient water till working level, after, heat bath solution till operating temperature.

Control parameter: compound concentration:40-80kg/1000l

Outlook: colourless or ivory white

Free alkali:0.3-2

Specific gravity(25 degree): 1.0±0.05

Ph:9-11

Spray pressure: 0.8-2.0bar

Temperature:40-60degree

Dipping time:3-15minutes

Spray time:60-80seconds

Testing method: free alkali: pipet 10ml sample into 250ml conical beaker, add 2-3 dripping phenolphthalein indicator, after drop 0.1N hydrochloric acid till pink disappear. The consumption of the hydrochloric acid is same as free alkalinity.

Total alkali: pipet 10ml sample into 250ml conical beaker, add 2-3 dripping Bromine phenol indicator, after drop 0.1N sulphuric acid till green disappear. The total consumption of the sulphuric acid is same as total alkali.

We could calculate the ratio between total alkali and free alkalinity(TFR).

Density

test sample with gravimeter in 25 degree

ph

test sample with acidometer

bath solution control: need to add 0.8kg/1000l when free alkali increase 0.1 point. The TFR will increase together with the Total alkali, and we could detect the pollution according to TFR.

Max TFR will be different according to the different workpiecessolid impurity and temperature. We could drain the bath solution regularly in continuous flow or automatic flow to maintain the TFR lower than MAX TFR.

Reserve requirement:

Reserve in dry shady and cool place to avoid sunshine.

Period of validity: one year

Package: 25kg/barrel, 200kg/barrel.

Effluent disposal: according to rules. Bath solution is week base, need to be neutralized and effluent disposal.