AS 4312-2019 PDF
Name in English:
St AS 4312-2019
Name in Russian:
Ст AS 4312-2019
Original standard AS 4312-2019 in PDF full version. Additional info + preview on request
Full title and description
AS 4312:2019 — Atmospheric corrosivity zones in Australia. This Australian Standard provides guidelines for classifying atmospheric corrosivity zones across Australia and describes their effect on the corrosion of steel and other metals, giving practitioners a framework to select appropriate corrosion protection and coatings for different environments.
Abstract
AS 4312:2019 defines atmospheric corrosivity categories for Australian conditions (linked to the corrosivity categories used in ISO 9223), describes factors that influence atmospheric corrosion (macro- and micro-climatic factors, salinity, industrial pollutants, time of wetness, sheltering and design), and gives guidance for determining external and internal corrosivity environments. It is intended to support material selection and protective-coating decisions for steel and other metals in Australia.
General information
- Status: Current (in force).
- Publication date: 29 October 2019.
- Publisher: Standards Australia.
- ICS / categories: 77.060 — Corrosion of metals.
- Edition / version: 2nd edition (revises AS 4312‑2008).
- Number of pages: 28 (publisher PDF length).
Scope
Provides guidelines for the classification of atmospheric corrosivity zones in Australia and for estimating the likely corrosion rates of steel and other metals in those zones. The Standard adopts the corrosion-rate categories and approach defined in ISO 9223 and excludes non-atmospheric environments (for example fully immersed, underground or splash-zone conditions), for which other standards apply.
Key topics and requirements
- Classification of atmospheric corrosivity zones for Australian conditions (C1 — very low to CX — extreme).
- Numeric guidance on typical corrosion-rate ranges and descriptors linked to ISO 9223 categories.
- Factors affecting atmospheric corrosion: macro-climatic (temperature/time of wetness), salinity (chloride deposition), sulfur pollutants, micro‑climatic and design influences (sheltering, geometry, wash-off, abrasion).
- Procedures and considerations for determining external and internal corrosivity environments and selecting appropriate protection (coatings, materials, design mitigation).
- Cross-references to related Australian and international standards used for protective coatings and specific environments.
Typical use and users
Used by structural and corrosion engineers, corrosion specialists, asset owners/operators, specifiers of protective coatings, fabricators and designers of metal structures and components, and standards bodies. Common applications include specifying corrosion protection for buildings, bridges, coastal structures, infrastructure, and industrial installations across Australian climatic zones.
Related standards
Links and cross-references include ISO 9223 (Corrosivity of atmospheres), AS 4312:2008 (superseded edition), AS/NZS 2312 (guide to protection of structural steel), and other Australian standards for buried or immersed structures and material‑specific guidance (for example AS 2159, AS/NZS 2041, AS 1720.1). These referenced documents provide further detail where AS 4312 excludes non-atmospheric conditions or where material-specific protection is required.
Keywords
atmospheric corrosivity, corrosivity zones, corrosion rates, C1 C2 C3 C4 C5 CX, ISO 9223, corrosion classification, protective coatings, structural steel, Australia
FAQ
Q: What is this standard?
A: AS 4312:2019 is the Australian Standard titled "Atmospheric corrosivity zones in Australia" that provides guidelines for classifying atmospheric corrosivity across Australia and assessing the likely corrosion of steel and other metals in those zones.
Q: What does it cover?
A: It covers classification of atmospheric corrosivity categories (aligned with ISO 9223), factors that influence atmospheric corrosion (time of wetness, salinity, sulfur pollution, microclimate and design), guidance for determining external and internal corrosivity, and application guidance for material selection and protective measures. It does not cover fully immersed, buried or splash-zone conditions.
Q: Who typically uses it?
A: Structural and corrosion engineers, coating specifiers, fabricators, asset owners, facilities managers and procurement/specification teams use the standard to choose materials and protection systems suitable for local corrosivity conditions.
Q: Is it current or superseded?
A: AS 4312:2019 is the current edition published in October 2019; it supersedes AS 4312‑2008.
Q: Is it part of a series?
A: It is linked to and intended to be used alongside related Australian and international standards (notably ISO 9223 for corrosivity categories and AS/NZS guidance on protective coatings and design). It functions as a national application of the ISO corrosivity classification to Australian conditions and sits within the broader suite of standards addressing corrosion protection and material selection.
Q: What are the key keywords?
A: Atmospheric corrosivity, corrosivity zones, corrosion rates, ISO 9223, C1–CX, protective coatings, structural steel, salt spray, time of wetness.