前言
国际标准化组织 (国际标准化组织) 是国家标准机构的全球联盟 (ISO成员机构). 国际标准的制定通常通过ISO技术委员会进行. 每个对已成立技术委员会的主题感兴趣的成员机构都有权在该委员会中派代表参加. 与 ISO 联络的国际政府和非政府组织也参与了这项工作. ISO 与国际电工委员会密切合作 (国际电工委员会) 关于电工标准化的所有问题.

用于开发本文件的程序以及用于进一步维护的程序在第 1 部分中进行了描述。 1 ISO/IEC 指令的. 尤其, 注意不同类型的 ISO 文件所需的不同批准标准. This document has been drafted in accordance with the editing rules in Part 2 ISO/IEC 指令的 (请参阅 iso.org/directives).

请注意，本文档的某些内容可能受专利权保护. ISO 不负责识别任何或所有此类专利. Details of any patent rights identified during the preparation of the document will be in the introduction and/or list of patent claims received by ISO (参见 iso.org/patents).

Any trade names used in this document are information provided for the convenience of the user and do not constitute an endorsement.

与合格评定相关的特定 ISO 术语和表达的含义的描述, 以及有关 ISO 遵守 WTO 技术性贸易壁垒原则的信息 (技术性贸易壁垒), 请参考以下网址: 前言 – 补充信息

负责本文件的委员会是 ISO/TC 156, 金属和合金的腐蚀.

国际标准化组织 18069-2015 “金属和合金的腐蚀 — 测定不锈钢和镍基合金在液体中均匀腐蚀速率的方法”

介绍
Stainless steel and nickel-based alloys generally have good corrosion resistance, but uniform corrosion occurs in acidic and alkaline solutions. Uniform corrosion rates in aqueous solutions are generally considered to be a fairly stable process as long as the corrosive environment is constant in terms of chemical composition, 温度, and flow conditions. 所以, uniform corrosion resistance of stainless steel and nickel-based alloys is usually determined by short-term laboratory sample immersion tests conducted under controlled conditions. 然而, in practical applications, the conditions of service may change somewhat, which may result in temporary activation of the surface of stainless steel or nickel-based alloys. Changes in temperature, fluctuations in air or other oxidants, exposure to less valuable materials (such as mild steel) or certain cleaners are all factors that may lead to activation in some cases.

所以, an important property to be studied is the ability of the material to passivate after activation, so the method includes activation of the sample. The corrosion rate determined by this test can be used as a basis for material selection and material life estimation.

1 范围
This standard specifies the expected corrosion rate of uniform corrosion of stainless steel and nickel-based alloys in liquids and the ability of materials to passivate after activation.

The method is intended to be used to estimate uniform corrosion rates of liquids under atmospheric conditions, chemical industry under specific environmental conditions, and not as a qualification test. It can also be used to determine isoetch graphs and temperatures where corrosion rates exceed 0.1mm /a.

This standard does not apply to excessive corrosion rates exceeding 1 mm/a, as higher corrosion rates indicate that stainless steel is not suitable for application.

This standard does not apply to solutions containing halides, especially chlorides, which may cause localized corrosion.

2 规范性引用文件
All or part of the following documents are referred to normatively in this document and are not available for their use. 对于注明日期的参考文献, only the quoted version applies. 对于未注明日期的参考文献, the latest version of the reference applies.

国际标准化组织 3696, Analytical laboratory water – 规格及测试方法

国际标准化组织 8044, 金属和合金的腐蚀 – Basic terms and definitions

国际标准化组织 17864, 金属和合金的腐蚀 – Determination of critical corrosion temperature under potentiostatic control

3 术语和定义
就本文件而言, ISO 中给出的术语和定义 8044 申请.

仅标准信息部分是公开的. 查看完整内容, 需要通过官方渠道购买标准.