How to put the samples of the salt spray corrosion test box

1. Preparation, maintenance and pretreatment of the sample rack of the salt spray box

Unless otherwise specified, samples can be prepared and maintained in accordance with the provisions of GB / T1765-79 (89) "Method for the Preparation of Paint Films for Determination of Resistance to Damp Heat, Salt Spray, and Weather Resistance (Artificial Acceleration)". The periphery can be coated with the tested product or a coating system that is more resistant to corrosion than the tested product. For the scribing test, a scribing tool with a tungsten carbide blade tip can be used to contact the surface of the sample plate to draw a uniform, non-burred V-shaped cut through all organic coatings on the substrate. line. If a test for scratching the metal coating is required, the degree of scratching should be agreed between the manufacturer and the user. If the user needs, a few lines (cross lines, parallel lines) can also be drawn after agreement. The quality of the lines can be observed with the help of a low magnification magnifier.

2. Test, test and inspection of the sample rack of the salt spray box

After the end of the curing period, a sample is left as a standard plate, and the remaining 3 pieces are put into the test box for exposure test. The sample plate should be placed on the sample plate support with the surface facing upward. No contact is allowed between the sample plates and between the sample plate and the cabinet, and the sample plates to be tested should not be placed on top of each other to prevent the droplets from splashing from the upper sample plate to the lower sample plate to affect the test results. The arrangement of the samples on the test rack should be changed at regular intervals, for example, the front row is exchanged with the middle row and the rear row.

3. The sample rack needs to be checked regularly during the salt spray box test

The salt spray test period is relatively long, generally several hundred hours, 1000h, 2000h and 4000h, and even used for a longer time. The test time can refer to the provisions of relevant product standards. Because the standard stipulates that the sample needs to be checked every 24h, the test time is generally a multiple of 24h. However, the exposure cycle recommended in the American ASTM D117-1997 standard can also be used, namely 12, 24, 48, 96, 200, 500, 720h

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