國際標準組織(ISO)於1992年發佈ISO 9223、9224、9225、92226共四項大氣腐蝕環境分類標準規範，即以量化方式來區分腐蝕環境，以解決環境分類不明確，造成研擬防蝕措施之困擾。根據是項規範，以板狀或螺旋狀標準金屬試屬量測腐蝕速率，以得到該區之腐蝕環境區分之腐蝕率指標値。其中螺旋狀試片是由貝爾實驗實發展出來一種快速，又靈敏的測試方式，在台灣工材所首先在全省裝設此種試片100組，以評估台灣本島的腐蝕狀況，本文特介紹此種測試方式及結果。

In 1985, the International Standard Organization (ISO) conducted a global exposure atmospheric corrosion test. There were 13 countries with a total of 47 different locations joining the program. Four classifications (ISO 9223, 9224, 9225, and 9226) of atmospheric corrosion testing specifications were then specified in 1992. According to the specifications, twenty ISO standard atmospheric testing stations and one hundred CLIMAT test stations were established around the Taiwan island in July, 1993. The technique of the CLIMAT test was employed originally by the Bell Lab. It was quickly recognized as an excellent and highly sensitive tool to resolve the problem of identifying and measuring the corrosivity of the atmosphere.