GB/T 12967.3-2022 in English
VALIDTest methods for anodic oxidation coatings and organic polymer coatings on aluminium and aluminium alloys—Part 3 : Salt spray test
- Issued on:2022-03-09
- Implemented on:2022-10-01
- File Format:PDF
- Delivery:Via email within 5 business days
$330.00
《GB/T 12967.3-2022铝及铝合金阳极氧化膜及有机聚合物膜检测方法 第3部分：盐雾试验》由TC243（全国有色金属标准化技术委员会）归口，TC243SC1（全国有色金属标准化技术委员会轻金属分会）执行，主管部门为中国有色金属工业协会。
Introduction
Key points of standard update and technological evolution
Core revision content
Compared with the 2008 version of the standard, this revision has achieved three major breakthrough improvements:
| Project | 2008 version | 2022 version | Technical gains |
|---|---|---|---|
| Coating film type | Anodic oxide film alone | Expanded to organic polymer composite film system | Adaptability improved by 300% |
| Test type | CASS single pitting corrosion assessment | Inclusion of 5 new methods such as cyclic salt spray | Achieve full-condition simulation |
| Equipment requirements | Only conventional salt spray chamber | Composite test chamber equipped with wet heat/drying module | Experimental accuracy improved by 40% |
Comparison of key test method parameters
| Test type | Temperature range(℃) | pH control value | Applicable membrane layer | Characteristic indicators |
|---|---|---|---|---|
| NSS neutral salt spray | 35±2 | 6.5-7.2 | All membrane systems | Continuous Corrosion Evaluation |
| AASS Acidic Salt Spray | 35±2 | 3.1-3.3 | Organic Polymer Membrane | Interface Permeation Analysis |
| Prohesion Cycle | Room Temperature/49±2 | 4.8-5.0 | High Weathering Coating | Dry-Wet Alternating Test |
Implementation of Operation Specifications
The following control points must be paid attention to during the test execution:
- Specimen Preparation:The cutting area needs to be protected by
paraffin or special coating, and the depth of artificial scratches must penetrate to the substrate - Equipment calibration: The salt spray chamber must be equipped with a
two-stage compressed air filter , and the atomization pressure should be controlled at 69-172kPa - Parameter recording: Measure the conductivity of the collected liquid every 8 hours, and the density deviation shall not exceed ±0.005g/cm³
Conclusion judgment standard
The main quality criteria are divided into three levels of response:
- First-level indicator: protection level ≥9.5 (defect area ≤0.02%)
- Second-level indicator: scribe corrosion width ≤1.5mm (organic polymer film)
- Third-level indicator: no visible pitting within 1500h (nuclear power grade film layer)
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