GB/T 13448-2006 彩色涂层钢板及钢带试验方法--耐雾实验
Salt spray corrosion test chamber, one or two atomizing nozzles, one salt solution storage tank, one air saturator and one oil-free and dust-free air supply system
A knife for cutting line on the coating, with a knife angle of 30 °, pH meter or precision pH test paper (measuring accuracy of 0.3). Weigh 50 g of sodium chloride reagent, dissolve it with distilled water and dilute it to 1000 ml, and mix it well. The
pH value of the prepared salt solution shall be between 6.5-7.2 in GB / T 13448.
The pH value can be measured by pH meter or by precise pH test paper. The pH value of the solution can be adjusted by hydrochloric acid or sodium hydroxide solution.
Salt mist collector: at least two collectors shall be placed in the tank, one close to the nozzle and one away from the nozzle.
10 cm diameter glass long neck funnel and graduated cylinder are recommended for collectors
Sample: the size is
75 mm × 150 mm, and the number of the same sample is not less than 3. The surface of the sample shall be flat, free of oil stain, damage and burr
The concentration of sodium chloride solution is (50 ± 5) g / L, and the pH value of the solution after
condensation is between 6.5-7.2. In every 80 ㎡ horizontal plane, the average amount of mist reduction collected per hour is (1.0-2.0) ml (calculated by the amount of salt mist collected in 24 hours). The sample shall be placed at 15 ° ^ - 30 ° from the
vertical direction in such a way that the salt mist can freely sink on all the samples. After the test box reaches the test conditions, continuous spray is carried out.
Result determination: after the test, take the sample out of the salt spray
box, wash it in clean water, blow it with cold air, and evaluate it immediately. According to GB / T 1766-1995, the foaming grade and rust grade shall be evaluated for the test results, and the worst value of parallel samples shall be taken as the test