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Commonly used surface treatment process
( 1 ) Process galvanized steel parts
┌ acid zinc
Degreasing rust → │ → → → drying passivation
└ alkaline zinc
( 2 ) steel parts room temperature blackening process
┌ dip rust oil dehydration
│
│ drying
Room temperature blackening degreasing rust → → → │ dip soap - → dip spindle oil or machine oil
│
│
└ dip sealers
( 3 ) steel parts phosphating process
Degreasing rust → → table adjustment phosphate → Painting
(4) ABS / PC plastic plating process
Degreasing → hydrophilic → pre coarsening (PC ≥ 50%) → → neutralization → roughening the entire surface of the glue → activation → → → chemical nickel plated brass coke acid copper plating → → plated half
Sulfur Nickel -plated bright nickel → → → bright nickel -plated chrome -plated seal →
(5) PCB electroplating process
Coarsening degreasing → → → → activation prepreg deflocculate → electroless copper plating → → → microetch acidic degreasing → low-stress nickel- plated bright nickel plated → → → plated
Drying
( 6 ) multi-layer plating process steel parts
Degreasing rust → → → copper cyanide plating acid copper plating semi- bright nickel plated → → → Sulfur Nickel -plated bright nickel -plated seal → → Nickel Chrome
( 7 ) Pre-treatment process of steel parts
( Polished parts, non- polished pieces )
1 . Wax polished pieces → → → hot dip degreasing electrolytic degreasing → Etching → Non- plating it
2 . Non- polished pieces → hot dip degreasing electrolytic degreasing → → → Other plating etching
( 8 ) zinc alloy plated with pre-treatment process
In addition to wax hot dip degreasing → → → Etching → electrolytic degreasing → alkaline copper plating acid copper plating or copper pyrophosphate plating → Others
( 9 ) pre-treatment of aluminum and its alloy plating process
In addition to wax hot dip degreasing → → → electrolytic degreasing cleaning → electroless etching zinc → pickling → New → secondary sink or nickel -plated copper base plating → Others
In addition to wax hot dip degreasing → → → electrolytic degreasing aluminum chrome etch cleaning → → drying → spray foam or spray drying or roughening → → finished
In addition to wax hot dip degreasing → → → etch cleaning electrolytic degreasing anodizing → dyeing → → → drying → Finished closed
( 10 ) pieces of iron chrome process
In addition to wax hot dip degreasing → → → anode cathodic electrolytic degreasing → → → pre acidic etching alkaline copper plating → Bright Acid Copper ( Select ) → bright nickel →
Chrome or other
In addition to wax hot dip degreasing → → → anode cathodic electrolytic degreasing → → → semi-bright nickel acidic etching → Sulfur Nickel Nickel → → bright nickel seal ( Select )
→ Chrome
( 11 ) chrome- plated zinc alloy Process
→ hot dip wax cathodic degreasing degreasing → pickling → → → alkaline bright copper copper pyrophosphate ( optional ) → Bright Acid Copper ( optional ) → bright nickel
→ Chrome
( 12 ) Power lacquer and staining process
Pre-treatment or plating → pure water ( 2-3 times ) → → Electric lacquer prepreg → Recycling → pure water ( 2-3 times ) → drying → Finished
Bright nickel plated stainless steel Process: organic solvent degreasing chemical degreasing → washing → → cathode electrolytic nickel flash activation → → washing → activation → washing → → washing → bright nickel plated passivated → washing → washing → hot water washing → drying → drying → acceptance.
Stainless steel bright nickel layer microstrip yellow silver white metal , it is harder than copper, zinc , tin , cadmium , gold, silver , etc. must be high, but lower than chromium and rhodium metal . Bright nickel in the air has a high chemical stability , good stability to alkali . Through the use of stainless steel brightener, may take polished bright nickel plated directly in order to improve surface hardness , wear resistance and leveling on the exterior of stainless steel and other nickel plated parts consistent look and avoid bright nickel stainless steel and other potential difference between the corrosion of the contact .
Bright nickel plated stainless steel brightener solution developed rapidly in recent years , many varieties . To sum up, brightener has experienced four years . The first generation of products for the most primitive saccharin gading acetylenic diol. Rounding may be plated a high level of bright nickel . Which flourished in the 20th century, the use of the sixties and seventies . However, due to the Ni plating butynediol bath instability , short life , the organic impurities accumulate quickly , requires frequent handling Nickel tank, Thus, by epichlorohydrin or propylene oxide with branches butynediol Results synthesis of the second generation nickel brightener , such as bE, 791 brightener, the situation has improved , BE and 791 retain alkynyl , and later advances will pyridyl polymerization up, forming a third-generation product , the light speed is more fast, less the amount of brightener life longer. Now further use of various combinations of intermediate nickel brightener brightener has grown to constitute a new fourth-generation product. Its use less light faster processing cycles longer throwing power stronger.
The bright nickel plated stainless steel process: the organic solvent degreasing → chemical oil ( oxygen and sodium 40g / L, sodium carbonate 30g / L, trisodium phosphate 50g / L, OP- emulsifier 3mL / L, temperature 80 ~ 90 ℃, time 30min) → washing → cathodic activation ( 1 +1 hydrochloric acid aqueous solution at room temperature , Dk1 ~ 3A/dm2, time 5min, carbon cloth anode plate ) → flash nickel ( nickel chloride 180 ~ 220g / L, 120g hydrochloride / L, temperature , current density 4A/dm2, time 5 ~ lOmin, the anode nickel plate ) → water washing → activation [ sulfuric acid 5% (V), time 5s] → washing → bright nickel plating ( time 5 ~ lOmin, or according to the thickness time ) → washing → passivation ( potassium dichromate 1s0g / L, sodium dichromate 150g / L, sulfuric acid 30 ~ 50mL / L, temperature , time 20 ~ 25s) → washing → washing → hot water washing → drying → drying → acceptance.