铁舾件的酸洗磷化工艺

Acid pickling and Parkerizing process

1. Process

degrease→wash→acid pickling→wash→alkali neutralizing→wash→phosphatizing→dry→seal→storage→shipment 2. Requirement

2.1 Degrease requirement

Remove antirust protective film, the duration of degrease depend on the antirust protective film condition. 2.2 Degrease aim

2.3 Acid pickling

2.3.1 Acid pickling: in order to remove all scale mill and rust, and not effect the

piping.

2.3.3 2.3.4 2.3.5

Temperature: normal temperature Treatment: dip

Notice: edge away put the pipe into the acid slot, often turn over it, and not air bubble in the inner pipe.

2.4 Alkali neutralizing

First use water washing the piping that has acid, then remove Cl-. 2.5 phosphatizing

A) The film: Phosphating coat.

B) Better adhesion between the phosphating coat protect film of pipe and coating.

The raw material: Phosphate, Zn2O, additive; Measurement standard of the phosphating: a) The film thickness: 8-12µm; b) Antirust ability ＞ 20 day;

c) Measurement the phosphating liquid: according to workload ensure the measure time, general, measure it every 3-7day, unless otherwise adjust it in time when unconventionally.

2.6 Dry