ISO 14993:2018 PDF
Corrosion of metals and alloys — Accelerated testing involving cyclic exposure to salt mist, dry and wet conditions
Corrosion of metals and alloys — Accelerated testing involving cyclic exposure to salt mist, dry and wet conditions
- Статус документа:
- Отменён
- Формат:
- Электронный (PDF)
- Количество страниц:
- 15
- Дата публикации:
- 26 июля 2018 г.
- Издание:
- ISO IS 14993 edition 2 version 1
- ICS:
- 77.060
This document specifies the apparatus and test procedure to be used in conducting accelerated corrosion tests for the comparative evaluation of metallic materials with or without permanent corrosion protection or temporary corrosion protection in salt-contaminated outdoor environments. The test involves cyclic exposure of the specimens to neutral salt mist, "dry" and "wet" conditions. The type of test specimen and the exposure period are not specified. The particular advantages of this test over common accelerated tests such as the neutral salt spray (NSS) test lie in its ability to better reproduce the corrosion that occurs in outdoor salt-contaminated environments. This document is applicable to — metals and their alloys, — metallic coatings (anodic and cathodic), — conversion coatings, — anodic oxide coatings, and — organic coatings on metallic materials. NOTE Methods of test for coatings to determine their resistance, in the presence of scribe marks through to the substrate, to various cyclic corrosion conditions which include the condensation of water on the test specimens during periods of humidity are given in ISO 11997-1.
Abstract
Overview
ISO 14993:2018 defines an accelerated cyclic corrosion test that better simulates outdoor, salt-contaminated environments than a simple neutral salt spray (NSS) test. The standard specifies the apparatus and test procedure for cyclic exposure of metallic specimens to neutral salt mist, dry, and wet conditions for comparative evaluation of metals, alloys and metallic/organic coatings. ISO 14993 is intended for material selection, R&D and quality control where realistic salt-driven corrosion behaviour is required.
Key topics and technical requirements
- Scope and applicability
- Applies to metals and alloys, metallic coatings (anodic/cathodic), conversion coatings, anodic oxide coatings and organic coatings on metal substrates.
- Test specimen type and total exposure period are not prescribed - the method is mainly comparative.
- Test solution
- Sodium chloride solution: 50 g/L ± 5 g/L prepared in deionized water (≤20 μS/cm).
- pH of collected sprayed solution: 6.5 to 7.2 at 25 °C ± 2 °C; adjust with HCl, NaOH or NaHCO3 if required.
- Salt purity limits for heavy metals and iodide are specified to avoid contamination effects.
- Apparatus and operation
- Test cabinet with homogeneous spray distribution; loading effects must be considered (small cabinets
Технические детали
- Технический комитет
- ISO/TC 156 - Corrosion of metals and alloys
- SKU
- ISO 14993:2018
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