Difference between revisions of "Conversion coatings (phosphate layer) in surface industry"

Latest revision as of 09:02, 1 September 2016

General flowsheet for the surface treatment of metals & plastics:

Literature: BAT for the surface treatment of metals & plastics, 2006

Process	Temperature [°C]	Heat transfer medium	Residence time	Chemicals	Concentration	Details	Literature
Alkali phosphating of aluminium	40-70 (can be lowered to 25-35 with special bath compositions)		5-10 sec	Aluminium, phospahte and fluoride solutions	2-15 g/l	Spraying of strip material	BAT for the surface treatment of metals and plastics, August 2006
Alkali phosphating of aluminium			1-3 min			Spraying or dipping of individuell parts
Zinc phospahting	up to 95			zinc, phosphate ions and an oxidizing agent, often sodium nitrite		pH: 3,2
Phosphating iron and steel	70-100		3-20 min	Zn, P2O5, NO3	Zn: 14 g/l; P2O5: 9,5 g/l; NO3: 21 g/l; freies P2O5:P2=5 gesamt=0,5		OE Patenschrift, Nr. 321055, Pateninhanber: Metallgesellschaft AG in Frankfurt am Main; Gegenstand: Verfahren zur Phosportierung von Eisen und Stahl, 28.Mai 1973
Manganese phospahting	95°C	continious					Institut für Normung, D. DIN EN 12476 (2001).

LITERATURE: BAT for the Surface Treatment of Metals and Plastics, May 2005

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 | style="background:#AACCEE;"| Phosphating iron and steel|| align="center"| 70-100|| align="center"| || align=”center”| 3-20 min|| align=”center”| Zn, P2O5, NO3|| align="center"| Zn: 14 g/l; P2O5: 9,5 g/l; NO3: 21 g/l; freies P2O5:P2=5 gesamt=0,5|| align="center"| || align="center"| OE Patenschrift, Nr. 321055, Pateninhanber: Metallgesellschaft AG in Frankfurt am Main; Gegenstand: Verfahren zur Phosportierung von Eisen und Stahl, 28.Mai 1973
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+| style="background:#AACCEE;"| Manganese phospahting|| align="center"| 95°C|| align="center"| continious || align=”center”| || align=”center”| ||  align="center"| || align="center"| ||align="center"|Institut für Normung, D. DIN EN 12476 (2001).
 |}