ISO 12944-9:2018规定了海上和相关结构物（即暴露于海洋大气中的结构物，以及浸入海水或微咸水中的结构物）防护涂料系统的性能要求。此类结构物暴露在腐蚀性类别CX（海上）和浸没类别Im4的环境中，如ISO 12944？2所定义。 ISO 12944-9:2018描述了符合ISO 12944-1的高耐久性涂料体系。 ISO 12944-9:2018适用于碳钢结构，不包括Cd/Bi-Cr和Zn/Bi-Cr表面。不适用于隔热或混凝土表面。 本文件适用于工作温度范围在-20°C和+80°C之间的油漆系统，性能测试旨在验证油漆系统在该温度范围内的适用性。 ISO 12944-9:2018适用于水下作业（Im4）的油漆系统，其预期环境工作温度最高可达50°C。 ISO 12944-9:2018规定: -用于确定防护涂料系统单独组件组成的试验方法； -用于评估防护涂料系统可能耐久性的实验室性能试验方法； -用于评估性能测试结果的标准。 ISO 12944-9:2018涵盖了启动前新工作和任何必要维修的要求。它也可用于进行全面整修且底层金属基底完全暴露在喷砂下的维护- 打扫。 ISO 12944-9:2018不涉及通常使用喷砂清理以外的表面处理方法的一般维护。 ISO 12944-9:2018涉及由厚度不小于3mm的碳钢制成的结构，其设计采用经批准的强度计算。 本文件不包括以下内容: -不锈钢结构以及铜、钛、铝或其合金结构； -钢缆； -地下结构； -管道； -储罐的内部。

ISO 12944-9:2018 specifies the performance requirements for protective paint systems for offshore and related structures (i.e. those exposed to the marine atmosphere, as well as those immersed in sea or brackish water). Such structures are exposed to environments of corrosivity category CX (offshore) and immersion category Im4 as defined in ISO 12944？2. ISO 12944-9:2018 describes paint systems for high durability according to ISO 12944？1. ISO 12944-9:2018 is applicable to structures made of carbon steel and does not cover Cd/Bi Cr and Zn/Bi Cr surfaces. It is not applicable to surfaces under insulation or concrete. This document is applicable for paint systems intended for a service temperature range between？20 °C and +80 °C, and the performance testing is aimed at verifying suitability of the paint systems for this temperature range. ISO 12944-9:2018 is applicable for paint systems for submerged service (Im4) which are intended for ambient operating temperatures up to a maximum of 50 °C. ISO 12944-9:2018 specifies: - the test methods to be used to determine the composition of the separate components of the protective paint system; - the laboratory performance test methods for the assessment of the likely durability of the protective paint system; - the criteria to be used to evaluate the results of performance tests. ISO 12944-9:2018 covers the requirements for new work and any repairs necessary before start-up. It can also be used in relation to maintenance where complete refurbishment is carried out and the underlying metal substrate is completely exposed by abrasive blast-cleaning. ISO 12944-9:2018 does not address maintenance in general where methods of surface preparation other than abrasive blast-cleaning are typically used. ISO 12944-9:2018 deals with structures, made of carbon steel of not less than 3 mm thickness, which are designed using an approved strength calculation. The following are not covered by this document: - structures built of stainless steel as well as those built of copper, titanium or aluminium or their alloys; - steel cables; - buried structures; - pipelines; - the interiors of storage tanks.