How to identify the corrosion resistance of bush?
Metal materials are lost and destroyed under the action of surrounding media (water, air, acid, alkali, salt, solvent, etc.). This corrosion will shorten the service life of rubber bushings. In the production of rubber bushings, the surface of the metal part is generally phosphated to prevent rust. There are also some products with higher requirements that will be galvanized or chrome-plated on the metal surface to improve the rust resistance of the plated parts, extend the rust-proof time of the product, and play a decorative role. Products or metal materials have certain requirements for corrosion resistance. At this time, a salt spray test is required to check the corrosion resistance and coating conditions.
Salt spray test is an environmental test that mainly uses artificially simulated salt spray environmental conditions created by salt spray test equipment to assess the corrosion resistance of products or metal materials. Most of the corrosion occurs in the atmospheric environment. The atmosphere contains corrosive components and corrosive factors such as oxygen, humidity, temperature changes and pollutants. The methods for judging the results of the salt spray test include: rating judging method, weighing judging method, corrosive appearance judging method, and corrosion data statistical analysis method. Corrosion is the destruction or deterioration of materials or their properties caused by the environment.
Salt spray tests are generally employed to produce rapid comparisons between expected and real corrosion resistance. Tests are carried out in a closed testing chamber, this produces a corrosive environment of dense saline fog to emulate a corrosive experiment. The appearance of corrosion products is evaluated after a period, the more corrosion resistant the coating is, the longer will be the period in testing without showing signs of corrosion.
The salt spray test standard is a clear and specific stipulation for the salt spray test conditions, such as temperature, humidity, sodium chloride solution concentration and pH value, etc., and also puts forward technical requirements for the performance of the salt spray test chamber. Which salt spray test standard is used for the same product should be selected according to the characteristics of the salt spray test, the corrosion rate of the metal, and the sensitivity to salt spray.
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How to identify the corrosion resistance of bush?
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