国际标准化组织 17872-2019 – Primer Guide for Marking with Paints and varnishes on Sheet Metal Coatings for corrosion Testing
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. 对已成立技术委员会的主题感兴趣的每个成员机构都有权在委员会中派代表参加. 与标准化组织联络的政府和非政府国际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) 关于电气标准化的所有问题.
用于制定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, 应注意不同类型ISO文件所需的不同批准标准. 本文件根据部分编辑规则起草 2 ISO/IEC 指令的 (请参阅 iso.org/directives).
国际标准化组织 17872-2019 – Primer Guide for Marking with Paints and varnishes on Sheet Metal Coatings for corrosion Testing
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This document is prepared by Technical Committee ISO/TC 35, 油漆和清漆, 小组委员会SC 9, General Test methods for paints and varnishes.
The second edition cancels and replaces the technically revised first edition (国际标准化组织 17872:2007). 与上一版相比, the main changes are as follows:
– 文章 2 “Normative reference” and Article 3 “术语和定义” have been added;
– Added L-shaped and diagonal scribe graphics;
国际标准化组织 17872-2019 – Primer Guide for Marking with Paints and varnishes on Sheet Metal Coatings for corrosion Testing
— A second variant of the cross-section shape marked with a U-dot is added to Figure 2;
– V-shaped replaceable inserts, disc milling cutters, engravers and ceramic cutters have been added to the list of possible cutting tools;
– The cross section picture has been added to the corresponding cutting tool;
– Examples of cutting tools in Table A.1 have been grouped into knife or insert tools, pencil tools, and milling machines;
— The original Appendix B has been replaced by a new annex that presents examples of the different results that may occur in a corrosion test when different marking tools are used.
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国际标准化组织 17872-2019 – Primer Guide for Marking with Paints and varnishes on Sheet Metal Coatings for corrosion Testing
介绍
Many international standards deal with corrosion tests in which scribe marks are introduced through coatings on metal substrates. 然而, the methods introduced by the underline mark (underline patterns, 工具, ETC。) are not standardized in these standards.
The main purposes of deliberately causing damage to the coating prior to corrosion testing are as follows:
1) Simulate and study how to ensure the adhesion of coating caused by damage after exposure;
乙) Obtain an accelerated response during corrosion testing, such as quality control in the production process;
C) Study the general durability of the coating by observing the corrosion rate as damage spreads after exposure.
Preliminary investigations indicated the use of several scribing tools in terms of shape and size. These differences occur both between and within countries. The effect of using different tools is to produce streaking marks with different cross-section shapes, depths and bare metal areas. These differences will greatly affect the test results obtained during the corrosion test, as the purpose of introducing the marking into the coating system is to enable the oxygen and electrolytes present during the exposure test to enter the well-defined and active metal surface.
The actual method used to introduce scribble marks depends on the coating type and thickness. 然而, in all cases, the recommendation is that the cross section be as smooth as possible, the metal substrate be evenly exposed, and there is no coating residue on the exposed substrate.
国际标准化组织 17872-2019 – Primer Guide for Marking with Paints and varnishes on Sheet Metal Coatings for corrosion Testing
1 范围
This document describes a method for performing corrosion tests on scrip-coated steel or specimens, where the coating system is applied at a dry film thickness of less than 500 微米. It is only used as a guide, based on the results of cooperative tests, and no subsequent corrosion tests are conducted to determine whether the introduced scribe marks are suitable for such tests.
This document covers the marking of metal panels or test pieces (chemically or non-chemically treated) made of:
– Steel;
– galvanized steel;
– 铝合金;
— Magnesium alloy.
It does not include the streaking of electroplated metal or composite aluminum plates.
2 规范性引用文件
The following documents are referenced in the text in such a way that some or all of their contents constitute the requirements of this document. 对于注明日期的参考文献, 仅引用的版本适用. 对于未注明日期的参考文献, 引用的新版本 (包括任何修订) 适用.
国际标准化组织 4618, 油漆和清漆 — 术语和定义
国际标准化组织 17872-2019 – Primer Guide for Marking with Paints and varnishes on Sheet Metal Coatings for corrosion Testing
3 术语和定义
就本文件而言, ISO 中给出的术语和定义 4618 apply.
ISO 和 IEC 在以下地址维护标准化术语数据库:
– ISO online browsing platform: 参见 iso.org/obp
– IEC电子百科全书: 可以在 electropedia.org/ 上找到
仅标准信息组件是公开的. 查看完整内容, 您需要通过正规渠道购买标准.