ISO/DIS 6509-2-2014 pdf free.Corrosion of metals and alloys一Determination of dezincification resistance of copper alloys with zinc 一 Part 2: Acceptance criteria.
This Part of ISO 6509 specifies acceptance criteria for the selection of dezincification resistant copper alloys with a mass fraction of zinc of more than 15 %, exposed to fresh, saline waters or drinking water. The acceptance criteria are based on the exposure tests in ISO 6509-1.
The materials tested and accepted can be in the form of a semi-finished product or in the form of a final product (fittings, valves etc.).
This standard 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 standard is not intended to validate dezincification in case of failure in the application.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 8044, Corrosion of metals and alloys — Basic terms and definitions
ISO 6509-1 Corrosion of metals and alloys — Determination of dezincification resistance of copper alloys with zinc — Part 1: Test method for the determination of the dezincijIcation depth
3 Terms and definitions
dezincification resistant copper alloy
copper alloys with a mass fraction of zinc more than 15 % tested according to ISO 6509-1 and fulililing the acceptance criteria in this standard
4 Acceptance criteria
The acceptance criteria given in Table 1 refer to dezincification depth determination using the method given in ISO 6509-1. For an alloy to be classified as dezincification resistant both the average and the maximum depth of dezincification shall be less than the values in Table 1.
The acceptance criteria in Table 1 are based on a large amount of tests and long experience in practice,mainly on sanitary household installations (see [1] – [3]). Copper alloys with zinc satisfying these acceptance criteria have been shown to satisfactorily resist dezincification. Nevertheless, the corrosivity of the local water should be assessed when applying these acceptance criteria as the likelihood of dezincification will depend on the local source of the water, flow rate and how well the system is managed. In some applications, more restrictive limits than listed in Table 1 might be required and relevant national standards should be consulted where applicable (for example JIS H 3250 for Japan [4] or BS EN 12288 for the UK [5]). The acceptance criteria for the application should be agreed between interested parties. Adherence to the appropriate acceptance criteria will provide guidance on selecting dezincification resistant alloys but does not necessarily fully qualify a material for service in these environments as there may be other factors that need to be accounted for in assessing suitably of a material for the application.ISO/DIS 6509-2 pdf free download.
Tags: Corrosion of metals and alloys
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