本文件规定了一个网格评级系统，该系统提供了一种定义经过腐蚀试验的铝及其合金上阳极氧化涂层性能水平的方法。 该评级系统适用于由以下原因引起的点蚀 -加速试验， -暴露于腐蚀性环境，以及 -实际服务测试。 该文献仅考虑了由保护性阳极氧化涂层的渗透导致的基底金属的点蚀。 注1 ISO 8993[1]描述了一个基于定义的图表比例的类似评级系统。 注2网格评级系统经常用于对相对较薄的阳极氧化涂层的短期腐蚀测试结果进行评级，例如汽车工业中使用的涂层。

This document specifies a grid rating system that provides a means of defining levels of performance of anodic oxidation coatings on aluminium and its alloys that have been subjected to corrosion tests. This rating system is applicable to pitting corrosion resulting from — accelerated tests, — exposure to corrosive environments, and — practical service tests. This document takes into account only pitting corrosion of the basis metal resulting from penetration of the protective anodic oxidation coating. NOTE 1 ISO 8993^[1] describes a similar rating system based on defined chart scales. NOTE 2 The grid rating system is frequently used for rating the results of short-term corrosion tests for relatively thin anodic oxidation coating, such as those used in the automotive industry.