作为研究低合金耐候钢的一部份,合金元素作用的研究已经开始了,自然曝露有缺点,即要取得可靠的结果,需要很长的曝露时间,同时分离和测量任何大气变化如二氧化硫或气温的影响也是困难的。鉴于这两个原因,人们决定做一个用于实验室试验框架,使它提供更快的结果,另外也能测定出一些大气因素影响的方法。有人明确规定一个干、湿周期应该是任何实验室试验的主要部份,在这个循环里耐候 Research into the role of alloying elements has begun as part of the study of low-alloy weathering steels. Natural exposure has the disadvantage that reliable results require long exposure times while separating and measuring any atmospheric changes such as sulfur dioxide or temperature The impact is also difficult. For these two reasons, people decided to make a framework for laboratory testing that would provide faster results and measure some of the effects of atmospheric factors. Someone clearly stipulated that a dry and wet cycle should be the main part of any laboratory test, and the weatherability in this cycle