ISO 4623-1:2018 PDF

Name: ISO 4623-1:2018 — Paints and varnishes — Determination of resistance to filiform corrosion — Part 1: Steel substrates
SKU: ISO 4623-1:2018
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Paints and varnishes — Determination of resistance to filiform corrosion — Part 1: Steel substrates

Название (английский):

ISO 4623-1:2018

Paints and varnishes — Determination of resistance to filiform corrosion — Part 1: Steel substrates

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 8
Дата публикации:: 5 октября 2018 г.
Издание:: ISO IS 4623 edition 2 version 1
ICS:: 87.040

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Описание (английский):

This document describes a test procedure for assessing the protective action of coatings of paints or varnishes on steel against filiform corrosion arising from a scribed mark cut through the coating. It is only suitable for assessing the performance of the coating/substrate combination tested. It is not suitable for predicting the performance of the coating on different substrates.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 4623-1:2018 specifies a laboratory test method to assess the resistance of paints and varnishes on steel substrates to filiform corrosion initiated from a scribed break in the coating. The procedure evaluates the protective action of a specific coating/substrate combination by deliberately introducing chloride at a scribe and exposing the panel under controlled temperature and humidity. Results are only valid for the tested combination and are not predictive for different substrates.

Key topics and technical requirements

Scope & limitation: Designed for coated steel test panels; results apply only to the tested coating/substrate pair.

Test principle: Create defined scribe(s) through the coating, introduce sodium chloride by dipping or salt fog, then expose panels at 40 °C and 80 % relative humidity to encourage filiform corrosion growth.

Test panels: Ground steel panels per ISO 1514, minimum size 150 × 75 × 0.3 mm; back and edges coated; coating thickness measured per ISO 2808.

Scribing: Two perpendicular scribes at least 30 mm long; cutting edge must fully penetrate the coating; use a mechanical scribing device where possible and verify metal visibility at ×10 magnification.

Initiation techniques:

Dipping: Immerse scribed panel in 1 g/L NaCl solution for 30–60 s, remove excess drops, place in the test cabinet; repeat every 3–4 days as specified.
Salt fog: Expose to neutral salt fog per ISO 9227; for durable systems salt fog exposure usually does not exceed 4 h.

Exposure conditions: Test cabinet maintained at (40 ± 2) °C and (80 ± 5) % RH. If automatic control is unavailable, a saturated ammonium sulfate solution provides ~79 % RH at 40 °C (guidance in Annex A).

Evaluation & reporting: Assess filiform corrosion extent using agreed criteria or ISO 4628-10; perform tests in duplicate and report sampling, conditioning (ISO 3270), apparatus, scribe method, exposure cycles, and measured coating thickness.

Applications and users

Quality control and batch acceptance testing of industrial, marine, and automotive coatings on steel

Product development and comparative performance testing

Failure analysis and warranty evaluations involving filiform corrosion Primary users include coatings manufacturers, independent test laboratories, corrosion engineers, specification writers, and procurement teams.

Related standards

Keywords: ISO 4623-1, filiform corrosion, paint testing, steel substrates, coating performance, salt fog, dipping technique, scribing, test cabinet, corrosion resistance.

ISO 4623-1:2018 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

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