ABSTRACT

The corrosion propagation rate during natural exposure tests of powder-coated steel and the relationship between natural exposure and accelerated cyclic corrosion testing (ISO 20340) results were investigated. Generally, during natural exposure, an initial fast increase in the corrosion area followed by a period where the corroded area grows very slowly are observed. As a consequence, the relative ranking between coating systems varies significantly as a function of test time. Correlation between natural exposure results and cyclic test results was not found; in many cases, a better performance in one test is associated with a worst performance in the other.

摘要

研究了粉末涂层钢自然暴露试验期间的腐蚀传播速率以及自然暴露与加速循环腐蚀试验 (ISO 20340) 结果之间的关系。通常，在自然暴露期间，可以观察到腐蚀面积的初始快速增加，然后是腐蚀面积增长非常缓慢的时期。因此，涂层系统之间的相对等级作为测试时间的函数而显着变化。未发现自然暴露结果与循环测试结果之间的相关性；在许多情况下，一个测试中的更好性能与另一个测试中的最差性能相关联。