ISO 11997-1:2017 塗料とワニス—繰り返し腐食条件に対する耐性の決定—パート1：ウェット（塩霧）/ドライ/湿度 | ページ 2

Foreword

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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 third edition cancels and replaces the second edition (ISO 11997-1:2005), which has been technically revised.

The main changes compared to the previous edition are as follows:

• the time for no drops of moisture are visible on the panels (see 6.4) has been changed;
• a reference to ISO 4628-8 for assessment of degree of delamination and corrosion around a scribe or other artificial defect has been added;
• a reference to ISO 4620-10 for assessment of degree of filiform corrosion has been added;
• the supplementary test conditions previously in Annex A have been integrated in the test report;
• the numbering and order of annexes has been changed;
• the adjustment procedure for the pH of the salt solution in Annex A to Annex D has been implemented from ISO 9227;
• the text has been harmonized with the latest edition of ISO 9227 where possible.

A list of all parts in the ISO 11997 series can be found on the ISO website.

Introduction

Coatings of paints, varnishes and similar materials are exposed to one of four cycles of wet and dry conditions specified in this document (see Annex A to Annex D), using specified salt solutions in a cabinet in order to simulate, in the laboratory, processes occurring in aggressive outdoor conditions, such as marine environments. Generally, correlation between such outdoor weathering and laboratory testing cannot be expected because of the large number of factors influencing the breakdown process. Correlation can only be expected if the effect on the coating of important parameters (e.g. the nature of the pollutant, the spectral distribution of the incident irradiance in the relevant photochemical region, the temperature of the specimen, the type and cycle of wetting and relative humidity) is known. In contrast to outdoor weathering, laboratory testing in a cabinet is performed with a reduced number of variables which can be controlled, and therefore the effects are more reproducible. The method described may also give a means of checking that the quality of a paint or paint system is being maintained.

The method has been found to be useful in comparing the cyclic salt spray resistance of different coatings. It is most useful in providing relevant ratings for a series of coated panels exhibiting significant differences in cyclic salt spray resistance.

The test cycles included in this document have been used successfully, with documented evidence, in the industry for the assessment of performance. The cycles can be summarized as follows.

• Cycle A (see Annex A ) : This cycle is specified in Japanese Automobile Standards JASO M 609-91 and JASO M610-92.
• Cycle B (see Annex B ) : This is based on the VDA 621-415 cycle and is widely used in Europe. It has also been shown to give good correlation with natural weathering for thermosetting paints in vehicle corrosion.
• Cycle C (see Annex C ) : This cycle was developed in the UK for use with water-soluble and latex paint systems and has been shown to give good correlation with natural weathering.
• Cycle D (see Annex D ) : This cycle is specified in Japanese Standard JIS K 5621-2003.

It is intended that other cycles will be added at later revisions of this document, as they are developed for evaluating other paint types.

ISO 11997-2 describes a method for determining the cyclic corrosion resistance of paints which includes UV exposure as part of the cycle. It has been found to give good correlation with natural weathering for industrial maintenance coatings.

1 Scope

This document specifies a method for the determination of the resistance of coatings to one of four defined cycles of wet (salt fog)/dry/humid conditions using specified solutions.

2 Normative references

3 Terms and definitions

No terms and definitions are listed in this document.

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

Bibliography