ISO9223大气环境腐蚀性分级标准更新解读

ISO 9223 Standard Update Interpretation for Corrosivity Categories of Atmospheres

国际标准化组织颁布了ISO 9223~9226标准，根据金属标准试件在环境中自然暴露试验获得的腐蚀速率及综合环境中大气污染物浓度和金属表面润湿时间对大气腐蚀性进行分类，具有广泛的适用性。但一些观测也表明ISO标准尚需进一步完善，为此国际标准化组织在2012年更新了此标准。围绕ISO 9223-2012与ISO 9223-1992的区别展开讨论，旨在对ISO 9223-2012标准的技术更新进行解读。主要技术更新有二：一是根据特定海洋/工业环境特点增加了大气腐蚀性分级；二是改进了推测性腐蚀分级方法，避免了由金属表面润湿时间计算不准确造成的大气腐蚀性分级偏差。

The International Organization for Standardization （ISO） established a classification system ISO 9223-9226 for the corrosivity of atmospheric environments. It defined corrosivity categories for the atmospheric environments by the first-year corrosion rate of standard specimens or made possible an informative estimation of the corrosivity category based on knowledge of the local environmental situation. ISO updated these standards in 2012 in view of the drawbacks existed in ISO 9223-1992. This work discussed the differences between ISO 9223-1992 and ISO 9223-2012 and was aimed at interpreting the technical updates of ISO 9223-2012. The main technical updates were composed of two parts： one was adding one corrosivity category of atmosphere on the basis of specific marine/industrial environments;the other was improving the informative estimation of the corrosivity category to avoiding the uncertainty for assessment of the corrosivity category generated by the uncertainty for calculation of time of wetness.