1.1 本指南涵盖了可用于检查和评估点蚀金属的程序的选择。这些程序包括无损和破坏性方法。 1.2 本指南涵盖的程序包括可用于腐蚀金属试样实验室评估和现场检查和检验的程序。 1.3 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考，不被视为标准值。 1.3.1 例外情况- 在里面 X1.2.1 ，mils/年（MPY）被视为目标腐蚀速率的标准。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 在需要预测金属结构剩余寿命的服务应用中，或在用于选择最耐点蚀材料的实验室测试程序中，能够确定点蚀程度很重要。研究目的对于确定适当的检查和评估步骤至关重要。 4.2 实验室测试的一些典型目的包括但不限于评估合金的性能，确定合金是否耐环境，评估包括缓蚀剂在内的环境条件如何影响或防止点蚀，以及评估许多金属是否足以在特定应用或环境中使用。 4.3 现场研究的一些典型目的包括但不限于确定凹坑是否可能增长并导致工艺流体泄漏或释放，以及协助确定是否更换或修复凹坑损坏（剩余寿命评估）。

1.1 This guide covers the selection of procedures that can be used in the examination and evaluation of pitted metals. These procedures include both nondestructive and destructive approaches. 1.2 The procedures covered in this guide include those that may be used in laboratory evaluations of corroded metal specimens and field examinations and inspections. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.3.1 Exception— In X1.2.1 , mils per year (MPY) are regarded as standard for the target corrosion rate. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 It is important to be able to determine the extent of pitting, either in a service application in which it is necessary to predict the remaining life in a metal structure, or in laboratory test programs that are used to select the most pitting-resistant materials for service. The purpose of the study is crucial in determining the appropriate examination and evaluation steps. 4.2 Some typical purposes of laboratory tests include, but are not limited to, evaluating performance of alloys, determining whether an alloy is resistant to the environment, evaluating how environmental conditions including corrosion inhibitor affect or prevent pitting, and evaluating whether a lot of metal is sufficiently resistant for its use in a particular application or environment. 4.3 Some typical purposes of field studies include, but are not limited to, determining if pits are likely to grow and cause leak or release of process fluid, and assisting a determination of whether to replace or repair damage from pits (remaining life assessment).