Zinc calcium metal film forming agent for iron and steel Phosphating treatment

Brief Introduction

JH-8139 metal film forming agent can generate the most suitable phosphate film former for paint base on the steel surface.

The chemical is suitable for dipping and spraying ways, dissolve small amount of rust,can produce excellent anti-rust film former.

Preparation of tank liquid

Add three-quarters of cold water into working tank,add 50kg-80kg JH-8139 metal film forming agent, for each 1000kg tank liquid.To make sure the total acid is 15-18

control parameter

Free acid       2.5-3.5point

Total acid       35-45point 

Acid ratio       15-18(the best one is about 16.5)

Temperature    65-75degree

Processing time   8-15min

process flow

Degreasing - washing - derusting -washing- washing-neutraization-watch-film forming - washing - washing

Preparation of tank liquid

1)Adjust 1000L total acid

With continuous working, total acid will drop, should inspect regularly and supplement,add 2.5kg of JH-8139 film forming agent,total acidity increased by 1 point.If the total acidity is too high,you can stop feeding,remain normal production, after a period of time to return to normal bath.

2)Adjust 1000L free acid

If free acid too high,can add sodium carbonate(or caustic soda) to adjust,usually add every 0.53kg sodium carbonate(or 0.4 caustic soda),can decline free acid 1 point.If the free acid to low,can add phosphoric acid to adjust,usually add every 0.85kg phosphoric acid,can increase free acid by 1 point.

3) The reason cause the film to thin:

A． Temperature too low

B． Total acid too low

C． Free acid too high

4)To make clean washing,overflow water volume should be kept in

         the best range

5) In the process of constant use of the groove dip to the workpiece, the proposed 2-3 minutes interval.

test method

Total acid

Use pipette to move 10 ml solution to conical flask,add 3 to 4 drops of phenolphthalein indicator,then titrated with 0.1N NaOH,until the color from colorless to stable red,then the wasting 0.1N NaOH is the total acidity bath.

Free acid

Use pipette to move 10 ml solution to conical flask,add 3 to 4 drops of bromorphenol blue indicator,then titrated with 0.1N NaOH,until the color from light yellow to light blue,then the wasting 0.1N NaOH is the total acidity bath.

Attention

Wear protective glasses, rubber gloves and wear protective clothing during processing.

Avoid direct contact with eyes,skin,clothing and equipment.

Get medical attention if accident happen.

packing

30kg/barrel

guarantee period

One year

wastewater treatment

Tank liquid is acidic,and contain phosphate,sewage may be required to neutralize or waste water treatment.