Test methods and related standards for salt spray resistance of anticorrosive coatings
With the continuous development of industrial technology, anti-corrosion coatings are more and more widely used in various fields. However, there are also differences in the quality and performance of anti-corrosion coatings due to different environments and conditions of use. In order to ensure the quality and performance of anti-corrosion coatings, various tests are required, among which the salt spray resistance test is one of the most important. In this paper, the test methods and related standards for salt spray resistance of anticorrosive coatings will be introduced and analyzed in detail.
1. The principle of salt spray resistance test.
The salt spray resistance test is an accelerated corrosion test method that simulates the marine environment, by spraying salt water on the surface of the coating to simulate the corrosive effects of salt spray and moisture in the marine environment. The principle of this test is to use the corrosivity of salt spray to accelerate the corrosion of the coating to test the corrosion resistance of the coating.
Second, the method of salt spray resistance test.
1.Spray method.
The spray method is to spray salt water directly on the surface of the coating, and simulate the corrosive effect of salt spray and moisture on the coating in the marine environment by controlling parameters such as salt concentration, temperature, humidity and spray volume. The advantage of the spray method is that it can simulate the corrosive effect of salt spray and moisture on the coating in the actual environment, but the disadvantage is that it requires a large amount of salt water and the test period is long.
2.Immersion method.
The immersion method is to soak the coating in salt water, and simulate the corrosive effect of salt spray and moisture on the coating in the marine environment by controlling parameters such as the concentration, temperature and soaking time of the brine. The advantage of the immersion method is that the test conditions can be easily controlled, and the disadvantage is that it is difficult to simulate the corrosive effect of salt spray and moisture on the coating in the actual environment.
3.Round-robin method.
The circulation method is to spray salt water on the surface of the coating, and then soak it, and so on, so as to accelerate the corrosion rate of the coating. The advantage of the cyclic method is that it can shorten the test time, and the disadvantage is that it requires a large amount of brine.
3. Relevant standards for salt spray resistance test.
1.GB T 10125-2012 "Artificial Atmosphere Corrosion Test - Salt Spray Test".
This standard stipulates the equipment, samples, test conditions, test procedures and result evaluation of salt spray test, and is one of the widely used standards at home and abroad. This standard is applicable to the salt spray resistance test of various metal materials and coatings, and is also one of the commonly used standards in automobiles, home appliances, construction and other fields.
2.GB T 1771-2007 "Determination of Neutral Salt Spray Resistance of Pigment Paints and Varnishes" This standard specifies the determination methods for the neutral salt spray resistance of pigments and varnishes, including the preparation of samples, test conditions, test procedures and result evaluation. This standard is applicable to the salt spray resistance test of various coating products, and is also one of the commonly used standards in the coating industry. Salt Spray Tester 3ISO 7253-1996 "Determination of Neutral Salt Spray Resistance of Pigments and Varnishes" This standard, similar to GB T 1771-2007, specifies the method for determining the resistance of basecoats and varnishes to neutral salt spray. This standard is widely adopted internationally and is one of the commonly used standards in the coatings industry. 4. ConclusionThrough the introduction and analysis of the salt spray resistance test methods and related standards of anticorrosive coatings, it can be seen that the salt spray resistance test is of great significance in the quality and performance testing of anticorrosive coatings. In practical application, appropriate test methods and standards can be selected according to the needs to detect the corrosion resistance of anti-corrosion coatings, so as to provide reliable guarantee for the application of anti-corrosion coatings. At the same time, in order to improve the corrosion resistance of anti-corrosion coatings, it is necessary to continuously strengthen the research and innovation of coating materials, preparation processes and application technologies.