BS EN ISO 4623-2-2016 PDF

Full title and description

STB / BS EN ISO 4623-2:2016 — Paints and varnishes — Determination of resistance to filiform corrosion — Part 2: Aluminium substrates. This standard specifies a laboratory test method to assess the protective action of organic coatings on aluminium against filiform (filamentous) corrosion initiating from a scribed defect in the coating.

Abstract

ISO 4623-2:2016 describes a scribe‑based test procedure for evaluating how coatings on aluminium resist filiform corrosion that propagates from a cut through the coating. The method is intended to assess the performance of a specific coating/substrate combination under defined test conditions and is not intended to predict performance on different substrates or in all service environments.

General information

• Status: Published / International Standard (confirmed following review).
• Publication date: 2016 (ISO edition 2, published August 2016).
• Publisher: International Organization for Standardization (ISO); adopted nationally/regionally in EN/BS and other national bodies.
• ICS / categories: 87.040 (Paints and varnishes).
• Edition / version: Edition 2 (2016).
• Number of pages: 7 (ISO published document length).

Scope

This part of ISO 4623 specifies a laboratory test procedure for assessing the resistance of organic coatings on aluminium substrates to filiform corrosion initiated by a scribe (a cut or scratch through the coating). It covers specimen preparation, scribe formation, test environment and exposure, observation and reporting of corrosion propagation. It is applicable only to the tested coating/substrate combination and does not provide a general predictive service-life assessment for other substrates or conditions.

Key topics and requirements

• Definition and nature of filiform (filamentous) corrosion on coated aluminium surfaces.
• Preparation of aluminium test panels and application of the coating under controlled conditions.
• Creation of a standardised scribe (cut) through the coating to initiate filamentous corrosion.
• Specification of environmental exposure conditions (humidity/temperature cycles or sustained humidity) for test duration.
• Observation, measurement and reporting of filiform corrosion propagation from the scribe (extent, rate, morphology).
• Limitations: intended for assessing the tested coating/substrate combination only; not for universal performance prediction.

Typical use and users

Used by coatings manufacturers, independent testing laboratories, quality‑control and R&D teams, specification writers, procurement and certification bodies who need a standardised laboratory method to compare coatings’ resistance to filiform corrosion on aluminium substrates. It is also referenced in product data sheets and conformity assessment when corrosion resistance on aluminium is required.

Related standards

ISO 4623 is a multi‑part series addressing filiform corrosion testing on different substrates; for example ISO 4623‑1 (Part 1) covers steel substrates (latest edition published as ISO 4623‑1:2018). National/adopted versions exist (EN ISO / BS EN ISO and other national designations).

Keywords

filiform corrosion, filamentous corrosion, paints and varnishes, coatings testing, aluminium substrate, scribe test, corrosion resistance, ISO 4623-2, laboratory method, quality control

FAQ

Q: What is this standard?

A: ISO 4623-2:2016 is an international standard that defines a laboratory test method for determining the resistance of coatings on aluminium to filiform (filamentous) corrosion that starts from a scribed defect in the coating.

Q: What does it cover?

A: It covers specimen preparation, creation of a standard scribe, controlled exposure conditions, observation and reporting of the extent and propagation of filiform corrosion on coated aluminium test panels. It is intended for assessing the tested coating/substrate combination only.

Q: Who typically uses it?

A: Coatings manufacturers, independent testing laboratories, product developers, QA/QC teams, specification authors and certification bodies that need an agreed test method to compare or verify filiform‑corrosion resistance on aluminium.

Q: Is it current or superseded?

A: ISO 4623-2:2016 is the current edition published in 2016; the ISO record shows the 2016 edition (edition 2) and indicates the document has been reviewed and confirmed in subsequent ISO reviews.

Q: Is it part of a series?

A: Yes — ISO 4623 is a series addressing filiform corrosion tests for different substrates (for example, ISO 4623‑1 covers steel substrates). The series provides part‑specific methods for different substrate/coating combinations.

Q: What are the key keywords?

A: Filiform corrosion, aluminium substrates, coatings testing, scribe test, paints and varnishes, corrosion resistance, ISO 4623-2.