Common faults and solutions before painting

Common faults and solutions before painting

Chengdu Yinguang Surface Technology Co., Ltd.

Degreasing tank

Common troubles cause solution Degreasing ability Poor concentration Low degreasing agent Low temperature Increase temperature Partial oil stain Excessively pre-wipe heavy oil with solid solvent Solid grease can not be removed by low temperature or pre-cleaning liquid level The emulsified oil has a high temperature and a high concentration. The bath liquid is emulsified to lower the temperature or the concentration tank liquid becomes black. The oil level in the liquid surface oil sump liquid is excessive to remove the oil slick or replace the bath liquid.

Pickling tank

Common causes of troubles Solution rust removal ability Low concentration Addition of hydrochloric acid tank liquid hydrochloric acid smog Large anti-fogging agent concentration Low addition JM-8 After rust removal, the surface of the workpiece has residual oil. The workpiece is brought into the oil to remove the liquid surface slick liquid black. Too much impurities to replace the bath or the tank surface float fugitive Fe2+ content is high to replace the bath or the tank

Table slot

Common faults Causes of the solution Solution Poor adjustment ability Low concentration Adding a table regulator Yellowing of the bath Acidic acid is introduced too much Change the bath

Phosphating film

Common faults Causes of solution Solution phosphating film uniform yellowing Total acidity is low Adding phosphating solution Free acidity is high Adding NaOH to reduce Promoter concentration is low Adding accelerator Phosphating time is short Prolong phosphating time

Phosphating film, color, ash

Localized non-phosphorus film

Low free acid base added industrial phosphoric acid surface adjustment effect Adding table adjustment agent secondary water rust or dry spots between processes to minimize secondary rust, appropriate reduction of pickling concentration Surface degreasing or rust removal of the workpiece is not completely removed first, then remove the phosphating film, and then Re-degreasing, rust-removing phosphating bath ratio adjustment adjustment or replacement of phosphating liquid workpieces when surface contact frame is installed to avoid or consider the phosphating film hair loss degreasing does not completely strengthen the degreasing or replace the degreaser table conditioning quality Poor or has failed to replace or add the normal parameters of the table to adjust the membrane difference tank fluid pollution aging replacement tank

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