NAN tongcolor steel tile anti-corrosion coating is widely used in all walks of life because of its strong anti-corrosion function. Then, the acid resistance and alkali resistance related to its anti-corrosion effect are very important, which will directly affect the performance of the coating. So let's learn about the basic resistance test method of Weihai color steel tile anticorrosive coating. 1. Under the condition of (23 ± 2) ℃, 100 ml distilled water was added to 0.12 g of calcium hydroxide to prepare the alkali solution (saturated calcium hydroxide). The pH value of the solution could reach 12 ~ 13. 2. Prepare the board on the asbestos cement board according to the requirements and dry it for 7 days under the specified test conditions. Take 3 prepared test boards, seal the edges and north sides of the test board with the mixture of paraffin and rosin (mass ratio: 1:1), and then immerse 2 / 3 of the area of the test board in the saturated calcium hydroxide solution with the temperature of (23 ± 2) ℃ until the specified time. 3. After the immersion, take out the test plate and wash it with water, use filter paper to dry the water drops, and observe whether there are blisters, cracks, peeling, pulverization, softening and dissolution on the coating surface. 4. Take the phenomenon of coating of more than two samples as the test result, the coating area within 5mm of the edge of the test plate and about 10 mm below the liquid level shall not be included in the evaluation. The above is the introduction of the test methods and steps for the alkali resistance of anti-corrosion coatings. The quality of this alkali resistance is usually reflected in the resistance of the coating film to alkali etching. Then, under the specified conditions, if the coating test board is immersed in a certain concentration of alkali solution, it will not appear white, lose light, blister, fall off and other phenomena, which means that the alkali resistance of the coating is Qualified.