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Analysis of Common Problems in Zinc Phosphating

Release time:

2023-03-15 11:46

 

Phosphating film layer loose, poor corrosion resistance, easy to rust

(1) The residual acid on the surface of the workpiece after pickling is not completely washed and neutralized.

(2) The workpiece stays in the air for too long after pickling.

(3) The surface of the workpiece is over-corroded during pickling.

(4) the table adjustment failure.

(5) phosphating total acid is too low, free acid is too high.

(6) The accelerator concentration is too low.

(7) phosphating time is too short.

(8) phosphating after washing is not clean or phosphating after washing acidity is too high.

 

Phosphating film is colored

(1) oil removal is not complete.

(2) the table adjustment failure.

(3) The total acid is too low or the free acid is too low.

(4) The accelerator concentration is too high.

 

After phosphating, the surface of the workpiece has the phenomenon of hanging ash.

(1) in addition to the oil is not clean or surfactant precipitation attached to the surface of the workpiece.

(2) The free acid is too low and the acid ratio is too high.

(3) the promoter is high.

(4) washing is not clean.

(5) aging bath liquid, sediment too much.

 

Phosphating film layer rough

(1) Table aging.

(2) low concentration of accelerator.

(3) high free acid.

 

Phosphating film is very thin, yellowing

(1) yellowing and rusting of the workpiece after pickling.

(2) the effect of table adjustment is not ideal.

(3) the total acid is low, the free acid is high or the acid ratio is too low.

(4) the accelerator concentration is low.

(5) phosphating time is too short.

 

Phosphating film is loose and porous, coarse and has poor binding force.

(1) Pickling excessive corrosion and residual acid cleaning is not clean.

(2) the table adjustment effect is not good.

(3) the workpiece before phosphating rust.

 

Phosphating film uneven, hair

(1) The surface of the workpiece is not clean after degreasing.

(2) the table adjustment effect is not good.

(3) There is a passivation layer on the surface of the workpiece.

 

Blistering or pinholes in the coating after painting

(1) The surface of the workpiece is not cleaned with oil.

(2) There is strong acid on the surface of the workpiece.

(3) the workpiece surface rust.

(4) spraying the workpiece is not completely dried.

(5) The powder is contaminated or damp.

 

Shrinkage cavity in coating after painting

(1) The degreasing tank contains silicon substances, such as silicon-containing defoaming agents, mold release agents and the like.

(2) degreasing tank degreasing is not complete.

(3) There is no exhaust pipe in the curing furnace, which leads to the exhaust gas after the powder is baked.

(4) Powder contamination.

(5) The air humidity is too low.

 

After spraying, there are sand particles on the surface of the workpiece.

(1) Hanging ash by phosphating.

(2) the oven is not clean.

(3) The dust in the workshop is too large.

(4) The use ratio of recycled powder is not appropriate.

(5) the oven is not clean.

 

Phosphating, workpiece, surface, clean, too low, pickling, accelerator, free, washing

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