Quality identification of pickling equipment

pickling equipment is based on the core principle of coordinated control of chemical corrosion and surface passivation. By optimizing the acid concentration, temperature accuracy and exhaust gas treatment system, it achieves the synergy of efficient metal surface oxide layer removal, roughness control and environmentally friendly emissions. It is widely used in steel cold rolling, metal plating pre-treatment, stainless steel finishing and electronic component cleaning and other fields. In the steel industry, it is used in the continuous pickling line of hot-rolled coils; in the automotive manufacturing field, it meets the galvanizing pre-treatment requirements of body steel plates; in the semiconductor industry, it ensures the micro-etching accuracy of lead frames. Compared with traditional processes, pickling equipment has the characteristics of high processing efficiency, low resource consumption, and high degree of automation. It is the core equipment for green manufacturing of metal surface treatment.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide pickling equipment quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for pickling equipment quality appraisal.

As environmental protection regulations become stricter, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: surface cleanliness after pickling is not up to standard, and heavy metals in wastewater exceed standards;

2, material defects: insufficient Cr content in stainless steel tank, titanium palladium Alloy pipes are sensitive to intergranular corrosion;

3. Process issues: Fluctuation in acid concentration control and VOC removal rate in exhaust gas treatment systems;

4. Contract performance disputes: key modules are inconsistent with the technical agreement.

1. Appearance inspection and dimensional measurement

Check whether the appearance of the pickling equipment involved is defective, deformed, corroded, etc.; measure the length, width, height and other dimensions of the equipment and compare them with design drawings or contract agreements.

2. Mechanical performance test

Test the transmission system, mechanical structure and other mechanical properties of the equipment, including:

- Motor power and speed test

0-Surface coating composition analysis

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24. The pickling process simulation test

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4 simulates the real pickling process under laboratory conditions, conducts functional tests on the pickling equipment involved, and evaluates the pickling efficiency, cleaning quality, passivation effect, etc. of the equipment.

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A cold rolling mill of the applicant signed a "Continuous Pickling Line Purchase Contract" with an equipment manufacturer of the respondent, stipulating that the residual oxygen content of the surface after pickling is ≤0.5g/m². After being put into production, corrosion spots appeared on the surface of the steel plates. The manufacturer argued that they were caused by water impurities.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "pickling equipment", contract technical agreements, on-site inspection case materials and other data, and made the following quality analysis opinions:

The acid concentration of the pickling equipment involved in the case fluctuated by ±8% (agreed ±3%), the recovery rate of the waste acid regeneration system was only 80% (agreed ≥95%); the Mo content of the tank material was 1.8% (agreed ≥2.0%), and the intergranular corrosion weight loss was 4.2g/m²·h (standard ≤3.0g/m²·h).

The appraisal conclusion concluded that defects in equipment materials and control systems are the main causes of corrosion.

The pickling equipment quality appraisal report should include:

1, appraisal purpose and reference standards;

2, specifications of the pipe involved, production batch number, construction record;

3, testing method Methods and equipment list;

4, correlation analysis of test data and failure;