The latest salt spray test chamber GBT10125-2012 standard appendix C

Organic coating test sample

C.1 Preparation and Painting of Test Panels

Unless otherwise specified, each test panel should be prepared in accordance with the ISO 1514 standard for salt spray testing. After preparation, the product or coating system under evaluation should be applied using the recommended method. It is also required that the back and edges of the panels be coated with the same product or system unless otherwise stated. If a different material is used for the back or edges, it must demonstrate superior corrosion resistance compared to the tested coating. This ensures accurate comparison during the testing process.

C.2 Drying and Conditioning of the Sample

Once the coating is applied, the test panels should be dried under controlled conditions. The drying environment should maintain a temperature of 23°C ± 2°C and a relative humidity of 50% ± 2%, with proper air circulation. Direct sunlight exposure should be avoided. The samples should be conditioned for at least 16 hours before proceeding with the test. It is important to conduct the test as soon as possible after this conditioning period to ensure consistency in results.

C.3 Coating Thickness Measurement

The dry film thickness of the coating should be measured in micrometers (μm) using non-destructive methods outlined in the ISO 2808 standard for salt spray testing. This step is crucial to ensure that the coating meets the required specifications and provides an accurate basis for evaluating its performance under corrosive conditions.

C.4 Scratch Application on Test Panels

Scratches are applied according to the procedures described in ISO 17872. Each scratch must be positioned at least 25 mm away from the edge of the test panel. The scratches should penetrate through the coating down to the substrate. A hard-tipped tool should be used to create straight, uniform lines. The width of the scratch on the metal substrate should range between 0.2 mm and 1.0 mm unless otherwise specified. One or two scratches can be made on the panel. Unless otherwise stated, they should be parallel to the longer side of the panel. For aluminum substrates, two scratches are typically made: one parallel and one perpendicular to the rolling direction, but they should not intersect. All tools used for scratching must be standardized and consistent to avoid variations in test results. This detailed procedure helps ensure that the test conditions are repeatable and reliable, allowing for accurate assessment of the organic coating's performance under salt spray conditions.

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