Product Characteristics:

Simple and safe process, good stability of tank liquid, long service life;

Unique components, loose process conditions, strong controllability;

Uniform corrosion, small amount of dissolved aluminum, aluminum consumption per ton of aluminum parts is not more than 5KG, equivalent to alkaline corrosion of aluminum consumption of 1/4, can reduce production costs.

Applicable to aluminum and aluminum alloy sand surface treatment, acid corrosion technology is the introduction of Japanese aluminum surface. Treatment technology, after gradual improvement, and industrialized production practice, proved that the use of good results.

Characteristics:

Simple process, safety, good stability of tank liquid, long service life.

Unique components, loose process conditions, strong controllability.

Uniform corrosion, small amount of dissolved aluminum, aluminum consumption per ton of aluminum parts is not more than 5KG, equivalent to alkaline corrosion of the aluminum consumption of 1/4, can reduce production costs.

Process parameters and bench conditions:

Process flow and solution composition:

Degreasing - washing - acid etching - washing - alkaline etching - washing - neutralization - washing - oxidation

Ammonium hydrogen fluoride: 50-60g/L

Solid acid etching agent: 2.5-3g/L

Working temperature: 40-50℃

Processing time: about 2-6 minutes (can be extended or shortened as needed)

Set working point: 6.5-8.5

Newly prepared tank: 50-60g/L ammonium hydrogen fluoride, 20g/L hydrofluoric acid, 6g/L solid acid etchant

Tank liquid maintenance:

According to the analysis result control the working point between working 6.5-8.5, replenish 100KG of ammonium hydrogen fluoride,and 5KG of acid etchant accordingly.

Under normal circumstances, replenish ammonium bifluoride and acid etching agent at least twice in each production shift.

Make every effort to keep the suspended matter in the acid etching tank at the minimum, and control the working temperature according to the process requirements.

Method of analysis:

Pipette 10.0 ml of the tank solution into a 250 ml conical flask, add 50-100 ml of pure water and shake well, add 3-4 drops of 1% phenolphthalein indicator, titrate with 1N NaOH standard solution, and the appearance of pink color is the end point.

Calculate the working point: N NaOH-VNaOH

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