ISO 18070:2015 金属および合金の腐食—ステンレス鋼製の平らな試験片またはチューブ用のディスクスプリングを備えた隙間腐食フォーマー | ページ 2

Foreword

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The committee responsible for this document is ISO/TC 156, Corrosion of metals and alloys.

Introduction

The working party on Marine Corrosion in the European Federation of Corrosion (EFC) has found that there is an industrial need for crevice corrosion testing for seawater applications that can estimate the maximum service temperature in natural seawater for stainless steels. Several aspects of crevice corrosion testing were elucidated by a research project.^[1] It was found that an important factor is the crevice forming technique, and in order to have controlled crevices, the disc spring loaded crevice former was introduced. The general idea is that the disc springs shall keep the clamping force as constant as possible. In addition to the crevice forming technique for plate specimens, a technique for a crevice former for tubular specimens was developed, which has given reproducible results.

Round robin testing for the crevice forming technique was performed for both laboratory testing and in natural seawater and it showed improvement compared to traditional crevice formers. Good correlation was found between the laboratory testing and natural seawater.

1 Scope

This International Standard specifies a crevice forming technique and crevice former which are intended to be used for crevice corrosion testing of flat specimens or tubes of stainless steels, in corrosive solutions. This International Standard specifies no information concerning how the crevice corrosion testing shall be performed and how the attack shall be evaluated. The crevice former specified in this International Standard can be used for electrochemical measurements, if the specimens are designed for electrical connections.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 8044 apply.

Bibliography