ISO 6509-2:2017
(Main)Corrosion of metals and alloys - Determination of dezincification resistance of copper alloys with zinc - Part 2: Assessment criteria
Corrosion of metals and alloys - Determination of dezincification resistance of copper alloys with zinc - Part 2: Assessment criteria
ISO 6509-2:2017 specifies assessment criteria and provides guidance related to the corrosion type dezincification for the selection of copper alloys with a mass fraction of zinc of more than 15 %, exposed to fresh, saline waters or drinking water. The assessment criteria are based on the exposure tests in ISO 6509‑1. The materials can be in the form of a semi-finished product or in the form of a final product (fittings, valves, etc.). ISO 6509-2:2017 is not applicable to complex products like flow-meters or pump-parts. In addition, other properties of the material might need to be taken into account for the intended application. This document is not intended to validate dezincification in case of failure in the application.
Corrosion des métaux et alliages — Détermination de la résistance à la dézincification des alliages de cuivre avec le zinc — Partie 2: Critères d'acceptation
General Information
- Status
- Published
- Publication Date
- 22-Mar-2017
- Technical Committee
- ISO/TC 156 - Corrosion of metals and alloys
- Drafting Committee
- ISO/TC 156/WG 2 - Environmentally assisted cracking
- Current Stage
- 9093 - International Standard confirmed
- Start Date
- 16-Jun-2022
- Completion Date
- 13-Dec-2025
Relations
- Effective Date
- 17-Nov-2012
Overview
ISO 6509-2:2017 defines assessment criteria and guidance for dezincification resistance of copper‑zinc alloys (brasses) with a zinc mass fraction > 15%, when exposed to fresh water, saline water or drinking water. The criteria are based on exposure tests specified in ISO 6509‑1 (test method) and apply to semi‑finished or finished products such as bars, fittings and valves. ISO 6509‑2:2017 is not intended for complex components (e.g., flow meters, pump parts) and does not validate failures in service.
Key topics and requirements
- Scope: Assessment criteria for dezincification in copper alloys with >15% zinc exposed to potable/fresh/saline waters.
- Test basis: Acceptance limits rely on dezincification depth measurements obtained using the ISO 6509‑1 exposure/test method.
- Minimum requirement: An alloy is classified as dezincification resistant only if both the average and maximum dezincification depths are below the limits in Table 1 (or applicable national limits).
- Numeric acceptance criteria (Table 1):
- Final forgings and castings after machining (including continuously cast bars): Average ≤ 100 µm, Maximum ≤ 200 µm
- Extruded bars/profiles for machining - longitudinal direction: Average ≤ 300 µm, Maximum ≤ 400 µm
- Extruded bars/profiles - transverse direction: Average ≤ 100 µm, Maximum ≤ 200 µm
- Limitations: Not applicable to complex products; other material properties (mechanical, microbiological, lead content, etc.) may also be required for specific applications. Local water chemistry, flow rate and system management affect dezincification risk and may require stricter limits.
Applications
- Selection and specification of dezincification‑resistant brasses for:
- Sanitary installations and plumbing fittings
- Valves and machined components used in drinking water systems
- Manufacturers’ quality control and material acceptance testing
- Useful for corrosion engineers, materials engineers, water utilities and procurement teams assessing alloy suitability for potable and saline water environments.
Who should use this standard
- Material suppliers and alloy producers
- OEMs producing fittings, valves and machined copper alloy parts
- Test laboratories performing ISO 6509‑1 exposure tests and reporting compliance to ISO 6509‑2
- Specification writers, QA/QC engineers and regulators for water systems
Related standards
- ISO 6509‑1 (Test method for dezincification resistance)
- ISO 8044 (Corrosion terms and definitions)
- Relevant national/product standards: JIS H 3250, EN 12288, NSF/ANSI 14; EN 12163–12168, EN 12420, EN 1982 (for complementary material/product requirements).
Keywords: ISO 6509-2, dezincification, dezincification resistance, copper alloys, brass corrosion, corrosion resistance, drinking water fittings, ISO 6509-1.
Frequently Asked Questions
ISO 6509-2:2017 is a standard published by the International Organization for Standardization (ISO). Its full title is "Corrosion of metals and alloys - Determination of dezincification resistance of copper alloys with zinc - Part 2: Assessment criteria". This standard covers: ISO 6509-2:2017 specifies assessment criteria and provides guidance related to the corrosion type dezincification for the selection of copper alloys with a mass fraction of zinc of more than 15 %, exposed to fresh, saline waters or drinking water. The assessment criteria are based on the exposure tests in ISO 6509‑1. The materials can be in the form of a semi-finished product or in the form of a final product (fittings, valves, etc.). ISO 6509-2:2017 is not applicable to complex products like flow-meters or pump-parts. In addition, other properties of the material might need to be taken into account for the intended application. This document is not intended to validate dezincification in case of failure in the application.
ISO 6509-2:2017 specifies assessment criteria and provides guidance related to the corrosion type dezincification for the selection of copper alloys with a mass fraction of zinc of more than 15 %, exposed to fresh, saline waters or drinking water. The assessment criteria are based on the exposure tests in ISO 6509‑1. The materials can be in the form of a semi-finished product or in the form of a final product (fittings, valves, etc.). ISO 6509-2:2017 is not applicable to complex products like flow-meters or pump-parts. In addition, other properties of the material might need to be taken into account for the intended application. This document is not intended to validate dezincification in case of failure in the application.
ISO 6509-2:2017 is classified under the following ICS (International Classification for Standards) categories: 77.060 - Corrosion of metals. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 6509-2:2017 has the following relationships with other standards: It is inter standard links to ISO 6509:1981. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase ISO 6509-2:2017 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of ISO standards.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 6509-2
First edition
2017-03
Corrosion of metals and alloys —
Determination of dezincification
resistance of copper alloys with zinc —
Part 2:
Assessment criteria
Corrosion des métaux et alliages — Détermination de la résistance à
la dézincification des alliages de cuivre avec le zinc —
Partie 2: Critères d’acceptation
Reference number
©
ISO 2017
© ISO 2017, Published in Switzerland
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ii © ISO 2017 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Assessment criteria . 1
Bibliography . 3
Foreword
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This document was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys.
This first edition of ISO 6509-2 cancels and replaces ISO 6509:1981, which has been technically revised.
A list of all parts in the ISO 6509 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved
INTERNATIONAL STANDARD ISO 6509-2:2017(E)
Corrosion of metals and alloys — Determination of
dezincification resistance of copper alloys with zinc —
Part 2:
Assessment criteria
1 Scope
This document specifies assessment criteria and provides guidance related to the corrosion type
dezincification for the selection of copper alloys with a mass fraction of zinc of more than 15 %, exposed
to
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