金属与合金的腐蚀 大气腐蚀性 分类,检测,评价

[中文适用范围]： 本国际标准建立了一个大气环境腐蚀性分类系统。它定义了基于标准试样第一年腐蚀速率的大气环境腐蚀性类别；给出了基于计算的标准金属第一年腐蚀损失的规范性腐蚀性类别估算剂量 - 反应函数；并提供了基于对当地环境状况的了解对腐蚀性类别进行信息性估算的可能性。本国际标准规定了金属和合金大气腐蚀的关键因素，即温湿度复合体、二氧化硫污染和空气中的盐分。温度也被认为是温带宏观气候区以外地区腐蚀的一个重要因素。温湿度复合体可以以润湿时间来评估。其他污染物（臭氧、氮氧化物、颗粒物）的腐蚀效应会影响腐蚀性和评估的一年腐蚀损失，但这些因素在根据本国际标准评估腐蚀性时不被视为决定性因素。本国际标准不表征特定服务大气（如化学或冶金工业中的大气）的腐蚀性。分类的腐蚀性类别和引入的污染水平可直接用于腐蚀损坏的技术和经济分析，以及腐蚀防护措施的选择。 [外文原描述]： ISO 9223:2012 establishes a classification system for the corrosivity of atmospheric environments. It defines corrosivity categories for the atmospheric environments by the first-year corrosion rate of standard specimens, gives dose-response functions for normative estimation of the corrosivity category based on the calculated first-year corrosion loss of standard metals, and makes possible an informative estimation of the corrosivity category based on knowledge of the local environmental situation. ISO 9223:2012 specifies the key factors in the atmospheric corrosion of metals and alloys. These are the temperature-humidity complex, pollution by sulfur dioxide and airborne salinity. The temperature-humidity complex can be evaluated in terms of time of wetness. Corrosion effects of other pollutants (ozone, nitrogen oxides, particulates) are not considered decisive in the assessment of corrosivity according to ISO 9223:2012. ISO 9223:2012 does not characterize the corrosivity of specific service atmospheres, e.g. atmospheres in chemical or metallurgical industries.