An accelerated test and equivalent evaluation method for simulating coatings in marine and atmospheric environments

Abstract

The invention discloses an acceleration test and equivalence estimation method of a simulation coating under marine atmospheric environment. The method comprises the following steps: sequentially performing multi-factor synergy test and salt spray test, and performing combined circulation. One test circulation cycle is 6 days, wherein one cycle of the multi-factor synergy test is 5 days and one cycle of the salt spray test is 1 day. The method is characterized in that conversion coefficients of the coating color difference or the light loss rate between the combined acceleration test in a laboratory and the marine atmospheric environment test are established, when the coating ageing mechanisms are essentially consistent under acceleration test and marine atmospheric environment, the color difference or the light loss rate during the marine atmospheric test is equivalently estimated by the acceleration test data in the laboratory under the same coating and the solar radiation, and the acceleration ratio can reach more than 8 times; the estimation result of the coating performance change is compared with the atmospheric exposure test result, and the error is less than 15%.

Description

technical field [0001] The invention relates to an accelerated test and an equivalent evaluation method for simulating a coating in a marine atmospheric environment, in particular to a multi-factor cycle combined accelerated test method for rapid evaluation of coating marine atmospheric environment adaptability and an equivalent evaluation marine Changes in coating properties in atmospheric environments. Background technique [0002] Coating is one of the most economical and effective means of anti-corrosion for metal materials and industrial products, and its aging resistance directly affects the stability of product performance. A large amount of data shows that the coating is aging due to the comprehensive influence of various environmental factors during use, especially the marine atmospheric environment with high radiation, high temperature, high humidity, and high salt spray is more likely to deteriorate the performance of the coating, resulting in Aging phenomena suc...

AI Technical Summary

Problems solved by technology

A large amount of data shows that the coating is aging due to the comprehensive influence of various environmental factors during use, especially the marine atmospheric environment with high radiation, high temperature, high humidity, and high salt spray is more likely to deteriorate the performance of the coating, resulting in Aging phenomena such as loss of light, discoloration, pulverization, and foaming seriously affect product performance and appearance. In consideration of market competition, manufacturers urgently need to obtain multi-factor combined accelerated test methods that can be used to quickly simulate marine atmospheric environment exposure tests , and a method that can equivalently evaluate the main performance changes of the coating in the marine atmospheric environment, so as to achieve the purpose of rapid screening, improvement and optimization of the coating

[0003] At present, most of the accelerated tests for simulating the marine atmospheric environment in the laboratory only consider a single environmental factor or multiple single environmental condition factors are applied to the coating surface sequentially, which cannot well simulate the marine atmospheric environment. Various environmental factors are applied to the coating comprehensively at the same time Surface conditions, especially the synergistic effect of multiple factors such as solar radiation, alternating wet and dry conditions, and temperature cycles on the coating, have seriously affected the reliability of the test results and the practicability of the test method.

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