EN ISO 12944-6:2018 PDF

Overview

EN ISO 12944-6:2018 - Paints and varnishes: Corrosion protection of steel structures by protective paint systems - Part 6: Laboratory performance test methods. This CEN-endorsed ISO standard specifies laboratory test methods and conditions used to assess protective paint systems for the corrosion protection of carbon steel, hot‑dip galvanized steel (ISO 1461) and steel with thermal‑sprayed metallic coatings (ISO 2063‑1 / ISO 2063‑2). Test results are intended to aid selection of suitable paint systems and are not exact predictors of in-service durability.

Key topics and technical requirements

• Scope of testing: Laboratory performance tests for coatings applied to uncoated steel, hot‑dip galvanized steel and thermal‑sprayed metallic surfaces. Excludes electroplated or already painted steel.
• Corrosivity categories considered: Environments defined in ISO 12944‑2 for C2 to C5 and Im1 to Im3.
• Test panels and sampling: Requirements for substrate preparation and number of test panels to ensure representative results.
• Test procedures and durations: Defined artificial ageing procedures (including salt spray and condensation tests) and a revised cyclic ageing test regime (normative Annex B).
• Assessment criteria: Inspections and measurements before and after artificial ageing, including criteria in new assessment tables for visible defects and adhesion.
• Reporting requirements: Test report items now include photographic documentation, thickness of zinc layer, and thickness of thermal‑sprayed metallic coatings, plus other relevant test details.
• Limits and controls: Requirements for maximum film thickness and scribe‑line procedures (see ISO 9227 and Annex A references).

Applications and who uses it

EN ISO 12944-6:2018 is used by:

• Coating manufacturers to validate and compare protective paint systems.
• Specifiers, consultants and engineers selecting coating systems for bridges, buildings, offshore and infrastructure steelwork.
• Contractors and applicators to confirm suitability of systems for a given corrosivity category.
• Inspection bodies and quality assurance teams performing laboratory assessments and compiling test reports.

Practical applications include laboratory screening of primer/topcoat combinations, validating coatings for specific corrosivity categories (C2–C5, Im1–Im3), and supporting tender or compliance documentation.

Related standards

• ISO 12944 series (general guidance and corrosivity categories)
• ISO 12944‑2 (corrosivity categories)
• ISO 9227 (salt spray testing)
• ISO 1461 (hot‑dip galvanizing)
• ISO 2063‑1 / ISO 2063‑2 (thermal‑sprayed metallic coatings)
• ISO 12944‑9 (cyclic ageing tests)

Keywords: corrosion protection, protective paint systems, laboratory performance test methods, EN ISO 12944-6:2018, cyclic ageing, salt spray, hot‑dip galvanized steel, thermal‑sprayed coatings, steel structures.