Anti-corrosion coating is a special coating with anti-corrosion effect, which is mainly used to prevent metal, wood and other materials from being corroded and damaged in harsh environments such as humidity, acid and alkali, and oxidation. Anti-corrosion coatings are usually composed of substrates, pigments, fillers, solvents, thinners, additives, etc. Its main function is to form a hard, corrosion-resistant, and wear-resistant protective film on the coating surface to achieve the purpose of preventing corrosion . Anti-corrosion coatings are widely used in ships, bridges, petrochemical, coal, chemical and other industrial fields.
What performance is tested?
The quality and performance of anti-corrosion coatings need to be tested in the following aspects:
Corrosion performance: The main function of anti-corrosion coatings is to prevent metal materials from being corroded and damaged in humid, acid-base, oxidation and other environments. Therefore, corrosion performance is one of the most important properties of anti-corrosion coatings. The detection method can be determined by methods such as salt spray test, damp heat test, and corrosion etch test.
Adhesion: The adhesion of anti-corrosion coatings has an important influence on the durability and corrosion protection effect of the coating. As a detection method, methods such as a cross grid method and a peeling method can be used for measurement.
Wear resistance and durability: The wear resistance and durability of anti-corrosion coatings have an important impact on the service life and corrosion protection effect. The detection method can be determined by methods such as an abrasion test.
Film thickness and density: The film thickness and density of anti-corrosion coatings have an important impact on the uniformity and corrosion protection effect of the coating. The detection method can be determined by methods such as coating thickness meter and density meter.
Gloss and color: The gloss and color of anti-corrosion coatings have an important impact on the appearance. The detection method can be determined by using equipment such as a gloss meter and a color Tester.
Heat and cold resistance: The performance of anti-corrosion coatings in high or low temperature environments has a significant impact on service life and corrosion protection. The detection method can be determined by thermal stability test, low temperature impact test and other methods.
Anti-ultraviolet performance: The anti-ultraviolet performance of anti-corrosion coating has an important influence on outdoor use and long-term protection effect. The detection method can be determined by methods such as ultraviolet aging test.
Coating hardness: The hardness of the anti-corrosion coating has an important influence on the durability and corrosion protection effect. The detection method can be determined by methods such as a pencil hardness test and a steel ball drop test.
Solvent residues: Solvent residues in anti-corrosion coatings have an important impact on the quality and environmental protection of the coating. The detection method can be measured by methods such as volatile organic compound (VOC) detection.
Filling and crack resistance: The filling and crack resistance of anti-corrosion coatings have an important impact on the flatness and durability of the coating. The detection method can be determined by filling test, crack resistance test and other methods.
Water absorption and water resistance: The water absorption and water resistance of anti-corrosion coatings have an important impact on the durability and corrosion protection effect of the coating. The detection method can be determined by methods such as water absorption test and water resistance test.
Shock resistance: The shock resistance of anti-corrosion coatings has an important impact on the protection of coatings in natural disasters such as earthquakes. The detection method can be determined by methods such as earthquake simulation test.
How to detect?
The following introduces some commonly used anti-corrosion coating detection methods:
Corrosion performance: It can be measured by salt spray test, damp heat test, corrosion and etching test and other methods.
Adhesion: It can be measured by cross grid method, peeling method and other methods.
Abrasion resistance and durability: It can be measured by a method such as an abrasion test.
Film thickness and density: It can be measured by methods such as coating thickness meter and density meter.
Gloss and color: It can be measured with gloss meter, color Tester and other equipment.
Heat resistance and cold resistance: It can be measured by methods such as thermal stability test and low temperature impact test.
Anti-ultraviolet performance: It can be measured by methods such as ultraviolet aging test.
Paint hardness: It can be measured by methods such as pencil hardness test and steel ball drop test.
Solvent residue: It can be determined by methods such as volatile organic compound (VOC) detection.
Filling and crack resistance: It can be measured by filling test, crack resistance test and other methods.
Water absorption and water resistance: It can be measured by water absorption test, water resistance test and other methods.
Earthquake resistance: It can be measured by methods such as earthquake simulation test.
Precautions
Choose the appropriate detection method according to different application requirements and purposes, for example, for anti-corrosion coatings used outdoors, UV aging test is required.
When testing, appropriate samples should be selected to ensure the representativeness and consistency of the samples.
When measuring paint film thickness and density, etc., it is necessary to pay attention to the accuracy and precision of the instrument.
When conducting corrosion resistance performance tests, it is necessary to select the appropriate corrosion medium and time to simulate the actual use environment.
When conducting a coating adhesion test, it is necessary to pay attention to the influence of factors such as the size and shape of the incision, the spacing and direction of the grid, etc. on the results.
When performing solvent residue detection, attention needs to be paid to the proper handling of solvents and the accuracy of the handling method.
In short, the above detection indicators and methods are only a part, and the actual detection methods still need to choose appropriate detection indicators and methods according to different use requirements and purposes. At the same time, the corresponding operating procedures and safety regulations should be followed during testing to ensure the safety of personnel and chemicals. The detection of anti-corrosion coatings requires careful experimental operation and scientific method selection to ensure the reliability and accuracy of the test results.
