SIST EN ISO 4623-2:2016 PDF

Name: SIST EN ISO 4623-2:2016 — Paints and varnishes - Determination of resistance to filiform corrosion - Part 2: Aluminium substrates (ISO 4623-2:2016)
SKU: SIST EN ISO 4623-2:2016
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Paints and varnishes - Determination of resistance to filiform corrosion - Part 2: Aluminium substrates (ISO 4623-2:2016)

Название (английский):

SIST EN ISO 4623-2:2016

Paints and varnishes - Determination of resistance to filiform corrosion - Part 2: Aluminium substrates (ISO 4623-2:2016)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 15
Дата публикации:: 3 октября 2016 г.
ICS:: 87.040
Технический комитет:: IBLP - Paints and varnishes

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Описание (английский):

ISO 4623-2:2016 describes a test procedure for assessing the protective action of coatings of paints or varnishes on aluminium against filiform corrosion arising from a scribe 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

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Overview

EN ISO 4623-2:2016 - "Paints and varnishes - Determination of resistance to filiform corrosion - Part 2: Aluminium substrates" - is a standardized laboratory test method published by CEN/ISO for assessing the resistance of paint and varnish coatings on aluminium substrates to filiform corrosion originating from a deliberate defect (scribe) in the coating. The procedure uses controlled exposure to hydrochloric acid vapour and accelerated climate conditions to evaluate whether coatings inhibit the characteristic thread-like (filiform) corrosion growth.

Key topics and technical requirements

Scope and limitation: The test assesses the protective action of a specific coating/substrate combination only; it is not intended to predict performance on different substrates or in every service environment.

Test principle: A scribe mark is cut through the coating; hydrochloric acid vapour is introduced into the scribe; panels are exposed in a test cabinet at controlled conditions and inspected for filiform corrosion growth.

Controlled exposure conditions: The standard specifies a test cabinet maintained at 40 °C and 82 % relative humidity (± tolerances) to promote filiform initiation and development.

Scribe and panel preparation: Scribe geometry and width are defined in the standard (see Clause 9.2); test-panel material, coating application, drying/conditioning and film thickness follow referenced preparation methods.

Reagent control: Use of analytical-grade 37 % hydrochloric acid (constant quality) for vapour generation is required.

Reproducibility and sampling: The method calls for triplicate determinations (changed from duplicate in earlier editions) and references established sampling and preparation standards.

Evaluation: Results are assessed using agreed criteria or by using ISO 4628-10 for the degree of filiform corrosion; test reports must document scribe tool, panel orientation, and other key parameters.

Applications and users

This standard is practical for:

Coating manufacturers validating formulations on aluminium

Independent test laboratories performing corrosion resistance testing

Quality assurance and R&D teams in industries using aluminium components (e.g., transport, building, consumer goods)

Specifications and procurement professionals who need objective corrosion-performance data By providing reproducible, accelerated test data for a given coating/aluminium pairing, the standard helps compare products, support quality control and inform material selection.

Related standards

ISO 4623-1 (Steel substrates)

ISO 4628-10 (Assessment of degree of filiform corrosion)

ISO 1513, ISO 1514, ISO 2808, ISO 3270, ISO 15528 (sampling, panel preparation, film thickness, conditioning, sampling)

Keywords: EN ISO 4623-2:2016, filiform corrosion, aluminium substrates, paints and varnishes, corrosion testing, scribe mark, hydrochloric acid vapour, coating resistance.

SIST EN ISO 4623-2:2016 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 4623-2:2016

Paints and varnishes — Determination of resistance to filiform corrosion — Part 2: Aluminium substrates

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