After completing the formula design, how to test the performance of the temperature-resistant anti-corrosion coating in the laboratory is the basic condition to measure the success of a formula. The following paint film temperature resistance tests are characteristic test items for heat-resistant and anti-corrosion coatings.
(1 ) Determination of heat resistance of paint film
According to the "Determination of Heat Resistance of Paint Film" [GB 1735-1979 (1989)], three painted samples were placed in a blast constant temperature oven adjusted to the temperature specified by the product standard. A painted sample was kept for comparison. After the specified time has elapsed, take out the painted sample, cool it to a temperature of 25°C, and compare it with a previously left painted sample to check whether it has peeling, wrinkling, bubbling, cracking, discoloration, etc. If there is no above phenomenon, it is qualified.
(2 ) Cyclic heating/anti-corrosion test
Prepare the coating test panel at the normal construction temperature, then put it into the oven and heat it at a rate of 20°C/min until the target temperature is stable. After reaching the target temperature, keep it for 8h, then cool down to ambient temperature naturally. After three heating/cooling cycles, the panels were used for various corrosion protection tests (accelerated and natural aging tests).
(3) Cyclic heating/dry and wet cycle (catheter test)
A coated catheter was placed on a heating tray (temperature gradient from 60 to 450°C) and heated. One cycle was heated for 8 hours, naturally cooled to room temperature for 16 hours, and then the catheter was immersed in 1L of 1% NaCl solution for 30 cycles.
(4) Thermal cycle based on ASTM D2485
The coating test panel is subjected to thermal cycle/quenching test in a cycle of 3 days , and the temperature of each the previous target temperature. The test panel after thermal cycle is used for salt spray test and natural aging test to detect corrosion resistance. The quenching in this test is to test the thermal shock resistance of the paint film.
(5 ) thermal cycle/immersion test
This test is similar to the cyclic heating/corrosion test operation, except that after completing the thermal cycle, the test panel is immersed in 95°C brine (1% NaCI and deionized water).
