Black Oxide Zinc Aluminum Coating / Galvanic White Passivation Zinc
JH-9201 is water based weak alkaline blackending agent, which is
utilized of tempering heat provides black coating on the surface of
the material. Environmental friendly, good black color effect, high
layer, excellent anti-rust function.
1.Adopt internal and external flim combined surface
treatment,excellent anti-corrosion performance.
2.Excellent high temperature resistance and aging resistance.
3.The black film is quickly solidified,no sticky,high-gloss,and
have no scraping phenomenon.
4.Environmental friendly,nontoxic and non volatility
|Corrosion resistance||Dip in 3%CuSO4||No change after 30s,10min copper separate out||GB/T 15519|
|Dip in 5%oxalic acid||No corrosion in 8min|
| ||Neutral salt spray test||No corrosion in 2 hours||GB/T 10125|
| ||Heat humidity test||No corrosion in 100 hours||GB/T 1740|
Materials proporation method
|Afterheat blackening agent is 100% concentrate original
liquid,packed in plastic drum. Preparation blackening agent,first
determine the total amount liquid,accommodated by the use of the
method of concentration requirements,take about 1/10 blackening to
the working tank, add water to the total amount,start the
circulation pump and stirring device,make the blackening agent
fully mix with water.|
Method of application
- Use concentration: the normal use of afterheat blackening agent
concentration is 8-10% (blackening agent and water 1:9-1:14),
improve the concentration can increase blackening and anti-rust
effect,can adjust according to the size of workpiece and
capacity,suggested max concentration no more than 15%, the min no
less than 6%.
- Recommended temperature of room temperature ~ 80 ℃, with prolonged
time of use,the solution temperature due to the heat into the
workpiece increases,suggest cycle cooling of blackening liquid.
- The workpiece is heated to 220-550 ℃,then can put into blackening
liquid instant black, depending on different materials the metal
parts,blackening time is generally 50s ~ 2min, to ensure the
cleanliness of the surface before the black, if oil or rust , you
need to clean rust, in order to ensure uniform film.
- Take the workpiece out of blackening liquid, without
washing,100-120 ℃ hot air drying, oiling Packaging
- Application range
Suitable for ML35,35,35K, 45,1018,1022,20Cr, 35CrMo, 40Cr, 42CrMo,
40CrMn, 40CrMnMo, 30CrMnSiA, 40Cr2MoV and other materials of
ordinary carbon steel,alloy steel,powder metallurgy parts and other
steel parts;suitable for mesh belt furnace,pit
furnace,multi-purpose furnace, box-type heat treatment furnace and
1.Regularly inspect PH value of blackening agent,add new solution
in time,the pH was controlled at 7.0 - 9.0.
2.Add blackening agent according to the production capacity,use
after stirring,add a small amount each time,try to keep blackening
agent system stable.
|3.JH-9201 after long-term use,will have insoluble sediment at the
bottom of the solution, it is recommended once every six months to
a year to clean the tank.|
4.If the blackening agent tank aging serious,there is no
improvement to add JH-9201 continuously,should replace the whole
5.When stop production for a long time, it is recommended that the
open loop device on a regular basis and add microbicides to prevent
Product specifications and the period of validity
Specifications: 20kg / barrel
Validity: Under normal storage conditions of no less than 1 year.