DeWe Brünofix GmbH

Fabrik für Metallchemie Pruppacher Weg 8
91126 Rednitzhembach

Tel: +49 09122 98680
Fax: +49 09122 986830
Email: info@dewe-bruenofix.de

Burnishing or phosphatising?

Parameter	Burnishing	Phosphatising
coating composition	iron (II)-, (III)-Oxide	Manganese phosphate secondary and tertiary also incorporated: secondary and tertiary iron phosphate
coating strengh	0,5 - 2 µm	3 - 15 µm (up to approx. 20 µm possible)
fit problems	none, because removal equal to application Surface structures preserved	must be appropriately considered in advance, because coating build-up from +2 µm to +30 µm
coating structure	amorphous	microcrystalline
other coating qualities	bend and pressure resistant resistant to solvents and paints soapy water does not attack coating acids attack coating	good sliding properties, reduction in sliding friction in non-cutting deformation anticorrosion oils and paints are absorbed well and barely wiped off in handling, so also very high corrosion protection good insulation resistance hardly any sub-surface migration of damaged coating with rust formation
coating colour	black	grey to black
working temperature	120 - 146 °C	approx 80 +/- 15 °C
exposure time	5 - 20 min.	8 - 15 min
quantity of chemicals fpr 100 l bath batch	50 - 70 kg	15 +/- 5 kg
salt spray resistance without oiling	up to 30 min.	up to 3 hr.
salt spray resistance with oiling	up to 70 hr.	up to 200 hr.
rust protection	relatively good in dry inside air, not so good with damp, acid air	very good, because deep penetration of anticorrosion oil into pores of microcrystalline coating possible
hazardous material aspect	highly alkaline - strongly corrosive, poisonous due to sodium nitrite component	corrosive - due to nitrate and acid component - but only mildly acidic
run-off water	neutralisation and decontamination	neutralisation
health & saftey	high temperatures and high alkalinity require appropriate preventive measures	mildly acidic, low temperatures
DIN	DIN 50938	DIN EN 12476