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51314-3762-Comparison of Accelerated Ageing Test as Per ISO 20340 Annex A and Nace SP0108 Standard

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Product Number: 51314-3762-SG
ISBN: 3762 2014 CP
Author: Nathalie Lebozec
Publication Date: 2014
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Testing the corrosion resistance of marine and offshore paint systems for C5M environment is crucial in order to make an appropriate and durable selection of the coatings as well as to validate surface preparations. The selection of the coatings is often based on results from accelerated corrosion tests performed in laboratory such as the conventional salt spray test (ISO 9227 ASTM B-117) or using cyclic corrosion tests. Among cyclic corrosion tests that are used for the qualification of offshore coatings two major test methods may be conducted upon which specifications ISO or NACE are selected. Indeed these refer to ISO 20340 Annex A and ASTM D5894 as cited in NACE TM 0304 and TM0404 and more generally in NACE SP0108. These testing methods differ a lot regarding the test duration (3 months for ASTM versus 6 months in ISO) the salt solution (Synthetic seawater in ASTM versus NaCl in ISO) the cycles as well as the sample preparation (scribe). However there are no data in the open literature comparing both testing methods in ranking offshore and marine coatings for C5M environments. In this paper the performance of 12 different paint systems applied on steel is assessed after ISO 20340 Annex A and ASTM D5894 accelerated corrosion tests. The results are compared with field exposure in C5M environment as well as with other accelerated corrosion test (ISO 16701).
Testing the corrosion resistance of marine and offshore paint systems for C5M environment is crucial in order to make an appropriate and durable selection of the coatings as well as to validate surface preparations. The selection of the coatings is often based on results from accelerated corrosion tests performed in laboratory such as the conventional salt spray test (ISO 9227 ASTM B-117) or using cyclic corrosion tests. Among cyclic corrosion tests that are used for the qualification of offshore coatings two major test methods may be conducted upon which specifications ISO or NACE are selected. Indeed these refer to ISO 20340 Annex A and ASTM D5894 as cited in NACE TM 0304 and TM0404 and more generally in NACE SP0108. These testing methods differ a lot regarding the test duration (3 months for ASTM versus 6 months in ISO) the salt solution (Synthetic seawater in ASTM versus NaCl in ISO) the cycles as well as the sample preparation (scribe). However there are no data in the open literature comparing both testing methods in ranking offshore and marine coatings for C5M environments. In this paper the performance of 12 different paint systems applied on steel is assessed after ISO 20340 Annex A and ASTM D5894 accelerated corrosion tests. The results are compared with field exposure in C5M environment as well as with other accelerated corrosion test (ISO 16701).
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Thus to establish the precision of ISO 20340 Annex A six laboratories participated in a round-robin evaluation of ISO 20340 annex A test method for the first time. The aim was to estimate the repeatability and the reproducibility of this test.
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SP0108-2008, Corrosion Control of Offshore Structures by Protective Coatings

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