ISO 17872:2019 塗料とワニス—腐食試験用の金属パネルのコーティングを介したスクライブマークの導入に関するガイドライン | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives ).

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This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.

This second edition cancels and replaces the first edition (ISO 17872:2007), which has been technically revised. The main changes compared to the previous edition are as follows:

• Clause 2,"Normative references" and Clause 3,"Terms and definitions" have been added;
• figures of L-shaped and diagonal shaped scribes have been added;
• a second variation of the cross-sectional shape of U-shape scribe mark has been added in Figure 2;
• V-shape replaceable blade, disc milling cutter, graver and ceramic knife have been added to the list of possible cutting tools;
• pictures of the cross sections have been added to the corresponding cutting tools;
• the examples for cutting tools in Table A.1 have been grouped to knife or blade tools, pencil type tools and milling machines;
• the original Annex B has been replaced by a new annex on examples of possible different results in one corrosion test when using different scribing tools.

Introduction

Many International Standards deal with corrosion testing ここで, scribe marks are introduced through a coating to a metallic substrate. However, the method of scribe-mark introduction (scribing pattern, tools, etc.) is not standardized across these standards.

The main purposes of an intentionally inflicted damage in a coating prior to corrosion testing are as follows:

• a) to simulate and to investigate how adhesion of a coating originating from an artificial damage after exposure is ensured;
• b) to obtain an accelerated response during a corrosion test, e.g. at quality control during production;
• c) to investigate the general durability of a coating by observation of the rate of corrosion at a damage spread after exposure.

Preliminary investigations have shown that several variants, both in terms of shape and dimensions, of scribing tools are used. These variations occur both across countries and within countries. The effect of using different tools is the production of scribe marks with different cross-sectional shape, depth and exposed metal area. These differences will greatly affect test results obtained during corrosion tests, as the intention of introducing scribe marks into a coating system is such that oxygen and the electrolyte present during exposure testing can obtain access to a well-defined and active metal surface.

The actual method used to introduce a scribe mark depends on the coating type and thickness. However, in all cases it is preferable if the cross-section is as smooth as possible, the metallic substrate is exposed evenly and no coating remains on the exposed substrate.

1 Scope

This document describes methods of scribing coated steel or test-pieces for corrosion tests ここで, the coating system is applied at dry film thicknesses of less than 500 μm. It is intended as a guideline only, being based on the results of a collaborative trial with no subsequent corrosion testing having been carried out to determine the suitability of the introduced scribe marks for such tests.

This document covers the scribing of metallic panels or test pieces (chemically treated or not) made from:

• steel;
• galvanized steel;
• aluminium alloys;
• magnesium alloys.

It does not cover the scribing of electroplated metal or clad aluminium panels.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. 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 4618 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography