Sheet metal surface treatment equipment quality appraisal

sheet metal surface treatment equipment is based on the core principle of collaborative control of chemical conversion and coating deposition. By optimizing the pre-treatment process, spraying parameters and curing curve, it achieves synergy of substrate adhesion, corrosion resistance and appearance quality. It is widely used in fields such as automobile bodies, home appliance casings, cabinet boxes and architectural decoration. In automobile manufacturing, it is used for automatic spraying of electrophoretic primers and topcoats; in the home appliance industry, it meets the fingerprint resistance and scratch resistance requirements of color steel plate pretreatment; in the cabinet production field, it ensures the uniformity and edge coverage of electrostatic powder coating. Compared with traditional equipment, sheet metal surface treatment equipment has the characteristics of high process integration, low energy consumption, and intelligent control. It is the core equipment for efficient and green manufacturing of surface engineering.

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

With the upgrade of environmental protection and quality requirements, related quality dispute cases have increased significantly. Judicial disputes focus on:

1, performance index disputes: whether the coating adhesion meets the standard, and the red rust area rate in the salt spray test exceeds the standard;

2, material defects: deviation in free acidity of phosphating solution, powder coating The glass transition temperature of the material does not meet the standard;

3. Process problems: insufficient pre-treatment degreasing rate, electrostatic spraying rotary cup speed fluctuation > ±5%;

4. Contract performance dispute: key modules do not match the technical agreement.

1. Appearance inspection

Visually inspect the overall appearance of the device, including whether there are scratches, dents, deformations and other defects.

2. Functional test

conducts actual operation tests on the device to verify whether it can work properly. The test content includes the starting, running, stopping and other functions of the equipment.

3. Material analysis

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The applicant, an auto parts factory, and the respondent, an equipment manufacturer, signed a "Fully Automatic Electrophoretic Coating Line Purchase Contract", stipulating that the coating should be resistant to salt spray for ≥1,000 hours. Half a year after it was put into production, the coating on the inner cavity of the car door peeled off. The manufacturer argued that it was caused by incomplete washing after phosphating.

Identification and analysis results:

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

The weight of the phosphating film of the sheet metal surface treatment equipment involved in the case is only 1.8g/m² (agreed 2.5-3.5g/m²), and the Ni content of the phosphating liquid is 0.4g/L (agreed) 0.9-1.3g/L); the temperature of the electrophoresis tank fluctuated ±4°C (agreed ±1°C), resulting in a 30% drop in electrophoresis force; corrosion of the substrate occurred after 648 hours in the salt spray test, and the adhesion was only 3.2MPa.

The appraisal conclusion concluded that defects in the equipment temperature control system and out-of-control phosphating process were the main causes of quality problems.

Sheet metal surface treatment equipment quality appraisal report mainly includes the following contents:

1. Client information

2. Appraisal equipment information

3. Appraisal basis (standard, power of attorney, etc.)

4. Identification method