Primer treatment and rust-proof treatment for aluminium coating

 

 

1.Process drawing

2.Examples

Process	Degreaser	Corrosive agent	Phosphatizing agent	After treatment
Chromium-free coating first coat	FC-315	CL-391	CT-3796	LN-5049
Chromium-free un-coated			CT-3762
Free of hexavalent chromium			CT-3700

3.Degreaser

Degreaser	Type	Treatment condition			Features
		Method	Temperature (℃)	Time (min)
FC-315	Weak base	Soak	65～70	1～10	Non-corrosive, free of N (contains boron)
RL-53	Medium alkali	Soak	50～80	5～10	Non-corrosive (silicate series)
FC-E3011	Weak base	Spray/soak	45～55	2～5	Non-corrosive, direct decomposition type surfactant (silicate series, free of boron)
FC-E3012	Medium alkali	Spray/soak	45～55	2～5	Corrosive, direct decomposition type surfactant (silicate series, free of boron)
FC-346	Medium alkali	Soak	50～65	3～5	Non-corrosive
FC-4418	Strong base	Spray	60～70	1～20S

4.Corrosive agent

Corrosive agent	Type	Treatment condition			Features
		Method	Temperature (℃)	Time (min)
CL-391	Strong base	Soak	60～80	Appropriate	Alkaline corrosive agent for aluminium materials
	Strong base (phosphoric acid series)	Soak	42～48	3～6	Adopts acidic corrosive agent (rust remover)

5.Phosphatizing agent

Phosphatizing agent	Type	Film appearance	Coating weight (mg/m2)	Treatment condition			Features
				Method	Temperature (℃)	Time (min)
CT-3700	Trivalent chromium	Colorless～interference color	Cr5～10	Spray/soak	45～55	1～3	Free of hexavalent chromium, in first coat
CT-3762	Zircon salt	Colorless	Zr10～100	Soak	50～70	30 sec.～3	Free of chrome, in wear-resistant first coat
CT-3796	Zircon salt	Colorless～interference color	Zr10～100	Spray/soak	45～55	1～3	Free of chrome, in first coat

6.After treating agent

After treating agent	Type	Film appearance	Treatment condition			Features
			Method	Temperature (℃)	Time (min)
LV-5049	Organic	Colorless	Soak	Normal temperature～55	10 sec.～1分	Free of chrome, contains resin, after treating agent

【Return】