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Phosphating creates thin, compact grained and antisoluble metal phosphate layers on the surface of ferrous parts.
Phosphating is an chemical process. By dipping parts into sour solutions the chemical reaction with the backing material creates a compact grained metal phosphate layer firmly bonded to the surface.
The statement ‘surface acc. to DIN 12476-Fe//Znph/r/8/T4 means: Parts are zinc phosphated for corrosion protection. The mass per unit area is 8 g / m². At the end the part is dipped into an water-in-oil emulsion for preservation.