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Analysis of Dust Hanging Problem of Galvanized Sheet Ceramic

Release time:

2023-03-15 11:47

cause analysis

The problem of hanging ash on the surface of the galvanized sheet mainly appears in two aspects, the first is the excessive corrosion of the surface of the substrate, and the second is the pollution of the external impurities in the process of the galvanized sheet.

Excessive corrosion of galvanized sheet generally appears in the following aspects:

Galvanized sheet in degreasing free alkalinity is too high, resulting in excessive corrosion of galvanized sheet surface.

The addition of caustic soda to the degreasing agent for galvanized sheet leads to excessive corrosion of the surface of the galvanized sheet during degreasing.

Galvanized sheet degreasing temperature is too high, too long caused by excessive corrosion of galvanized sheet.

Galvanized sheet in the pretreatment process by acid (such as acid tank, acid gas, acid tank after the water washing tank, etc.) caused by the corrosion of ash.

Some galvanized sheet surface there is a layer of organic passivation layer, the passivation layer in the process of pre-treatment damage, and attached to the board surface is not completely off, resulting in the board surface hanging ash.

Galvanized sheet in the process of external impurities pollution generally appear in the following aspects:

1. The dirt of the water washing tank after pottery is turbid, causing impurities to be adsorbed on the surface of the workpiece and hanging ash during washing.

2. The dust in the working environment of the pretreatment line is too large, causing the dust to be adsorbed on the surface of the workpiece and hang ash.

 

Solution

Strictly control the free alkalinity in the deoilbath of galvanized sheet between 5-15pt.

Degreasing agent can not add caustic soda, potassium hydroxide and other strong alkaline substances.

Strictly control the oil removal temperature of the oil removal tank between 25 ℃ and 50 ℃, and the time between 3 and 5min.

Strictly control the corrosion of galvanized sheet by acidic substances in the pretreatment process.

Change the pottery water washing tank frequently and keep the overflow water washing.

The pretreatment line should be used in a good environment.

 

Problems, galvanized sheet, corrosion, surface, treatment, in-process, excessive, water washing, causing, affected

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