GB/T 17897-2026 金属和合金的腐蚀 点腐蚀试验方法 Corrosion of metals and alloys—Corrosion test for pitting corrosion于2026年4月30日正式发布，2026年11月01日实施。

本标准修改采用ISO国际标准ISO 17864：2005 Corrosion of metals and alloys — Determination of the critical pitting temperature under potientiostatic control（金属和合金腐蚀 恒电位控制下的临界点蚀温度测定）

本标准全部替代如下标准：

GB/T 17897-2016 金属和合金的腐蚀 不锈钢三氯化铁点腐蚀试验方法（Corrosion of metals and alloys—Corrosion test for pitting corrosion resistance of stainless steels in the ferric chloride solution），和

GB/T 32550-2016 金属和合金的腐蚀 恒电位控制下的临界点蚀温度测定（Corrosion of metals and alloys—Determination of the critical pitting temperature under potentiostatic control）

以下为ISO标准中的引言和范围摘选：

Introduction引言

Stainless steel is susceptible to pitting corrosion, crevice corrosion, and stress-corrosion cracking, etc., although it is used as generally a corrosion-resistant material. Pitting phenomenon is generally of a random nature, therefore its measurement requires at least a couple of values. Critical pitting temperature defines the lowest potential-independent temperature, below which pitting does not occur.

The basic methodology was first standardized in ASTM G150, Standard test method for electrochemical critical pitting temperature testing of stainless steels.

1   Scope范围

This International Standard describes the procedure for determining the critical pitting temperature for stainless steels (austenitic, ferritic/austenitic, ferritic stainless steel) under potentiostatic control.

The principal advantage of the test is the rapidity with which the critical pitting temperature can be measured in a single test.

The critical pitting temperature, as determined in this International Standard, can be used as a relative index of performance, for example, to compare the relative performance of different grades of stainless steel. The test described in this International Standard is not intended to determine the temperature at which pitting will occur in service.