ISO 17872-2019 – Primer Guide for Marking with Paints and varnishes on Sheet Metal Coatings for corrosion Testing
A Prakata
ISO (Pertubuhan Antarabangsa untuk Standardisasi) adalah perikatan global badan standard kebangsaan (Badan ahli ISO). Pembangunan piawaian antarabangsa biasanya dijalankan melalui jawatankuasa teknikal ISO. Setiap institusi ahli yang berminat dalam subjek yang mana jawatankuasa teknikal telah ditubuhkan mempunyai hak untuk diwakili dalam jawatankuasa. Pertubuhan Antarabangsa Kerajaan dan Bukan Kerajaan yang Liaisasikan dengan Pertubuhan Standardisasi juga terlibat dalam kerja ini. ISO bekerjasama rapat dengan Suruhanjaya Elektroteknikal Antarabangsa (IEC) mengenai semua perkara standardisasi elektrik.
Prosedur yang digunakan untuk membangunkan dokumen ini serta yang digunakan untuk penyelenggaraan selanjutnya diterangkan sebahagiannya 1 Arahan ISO/IEC. khususnya, perhatian harus diberikan kepada kriteria kelulusan berbeza yang diperlukan untuk pelbagai jenis dokumen ISO. Dokumen ini telah digubal mengikut peraturan editorial Bahagian 2 Arahan ISO/IEC (lihat iso.org/directives).
ISO 17872-2019 – Primer Guide for Marking with Paints and varnishes on Sheet Metal Coatings for corrosion Testing
Sila ambil perhatian bahawa kandungan tertentu dokumen ini mungkin tertakluk kepada hak paten. ISO tidak bertanggungjawab untuk mengenal pasti mana-mana atau semua hak paten tersebut. Butiran mengenai hak paten yang dikenal pasti semasa pembangunan dokumen itu akan berada dalam pengenalan dan/atau dalam senarai ISO tuntutan paten yang diterima (lihat iso.org/patents).
Sebarang nama perdagangan yang digunakan dalam dokumen ini disediakan sebagai maklumat untuk kemudahan pengguna dan tidak menjadi pengesahan.
Voluntary, piawaian yang berkaitan dan penilaian pematuhan berkaitan istilah khusus ISO dan menyatakan maksud dan ISO dalam halangan teknikal untuk perdagangan (TBT) mematuhi prinsip organisasi perdagangan dunia (WTO) maklumat, sila lihat iso.org/iso/foreword.html.
Dokumen ini disediakan oleh Jawatankuasa Teknikal ISO/TC 35, Cat dan varnis, Subcommittee SC 9, General Test methods for paints and varnishes.
The second edition cancels and replaces the technically revised first edition (ISO 17872:2007). Compared with the previous edition, the main changes are as follows:
– Article 2 “Normative reference” and Article 3 “Terma dan definisi” have been added;
– Added L-shaped and diagonal scribe graphics;
ISO 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.
Any feedback or questions regarding this document should be directed to the user’s national standards body. A full list of these agencies can be found at iso.org/members.html.
ISO 17872-2019 – Primer Guide for Marking with Paints and varnishes on Sheet Metal Coatings for corrosion Testing
pengenalan
Many international standards deal with corrosion tests in which scribe marks are introduced through coatings on metal substrates. Namun begitu, the methods introduced by the underline mark (underline patterns, tools, dan lain-lain.) 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;
b) 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. Namun begitu, 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.
ISO 17872-2019 – Primer Guide for Marking with Paints and varnishes on Sheet Metal Coatings for corrosion Testing
1 Skop
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 μm. 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;
– aloi aluminium;
— Magnesium alloy.
It does not include the streaking of electroplated metal or composite aluminum plates.
2 Rujukan normatif
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. Untuk rujukan bertarikh, hanya versi yang dipetik digunakan. Untuk rujukan tidak bertarikh, versi baru rujukannya (termasuk sebarang semakan) berlaku.
ISO 4618, Cat dan varnis — Terma dan definisi
ISO 17872-2019 – Primer Guide for Marking with Paints and varnishes on Sheet Metal Coatings for corrosion Testing
3 Terma dan definisi
Untuk tujuan dokumen ini, terma dan definisi yang diberikan dalam ISO 4618 memohon.
ISO dan IEC mengekalkan pangkalan data terminologi untuk penyeragaman di alamat berikut:
– Platform pelayaran dalam talian ISO: available at iso.org/obp
– IEC Electronic Encyclopedia: boleh didapati di electropedia.org/
Hanya komponen maklumat standard tersedia secara umum. Untuk melihat kandungan penuh, anda perlu membeli piawaian melalui saluran rasmi.