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Offshore Atmospheric Coating Performance Evaluation Test Standards - NACE Vs. ISO

Product Number: 51321-16902-SG
Author: Sai P. Venkateswaran; Andy Bodington; Tim Bieri; Benjamin T. A. Chang
Publication Date: 2021
$20.00
$20.00
$20.00

There are two well recognized international standards to evaluate offshore atmospheric coatings. One
is ISO-12944-9 (historically referenced as ISO 20340) and the other one is NACE TM 0404 (new
construction) /TM 0304 (maintenance) with acceptance criteria referenced in NACE SP 0108. The
major differences between the ISO and the NACE standards are the cyclic test method and the test
duration for the rust creepage test. The ISO requires a 25-week cyclic test duration and NACE standard
requires 12 weeks only. Furthermore, the NACE standard requires other coating properties - edge
coverage (retention), thermal cycling and coating flexibility to be evaluated.
In this experimental program, ten coatings (zinc rich epoxy and non-zinc rich epoxy) systems are
evaluated using both test standards. The coatings were applied on grit blasted new steel panels to SP-
10 surface cleanliness. The rust creepage test results reveal both standards can differentiate the same
good and bad coating systems. In a comparative coating performance evaluation, the NACE method
provides an efficient and holistic approach towards reliable coating system selection for offshore
platforms.

There are two well recognized international standards to evaluate offshore atmospheric coatings. One
is ISO-12944-9 (historically referenced as ISO 20340) and the other one is NACE TM 0404 (new
construction) /TM 0304 (maintenance) with acceptance criteria referenced in NACE SP 0108. The
major differences between the ISO and the NACE standards are the cyclic test method and the test
duration for the rust creepage test. The ISO requires a 25-week cyclic test duration and NACE standard
requires 12 weeks only. Furthermore, the NACE standard requires other coating properties - edge
coverage (retention), thermal cycling and coating flexibility to be evaluated.
In this experimental program, ten coatings (zinc rich epoxy and non-zinc rich epoxy) systems are
evaluated using both test standards. The coatings were applied on grit blasted new steel panels to SP-
10 surface cleanliness. The rust creepage test results reveal both standards can differentiate the same
good and bad coating systems. In a comparative coating performance evaluation, the NACE method
provides an efficient and holistic approach towards reliable coating system selection for offshore
platforms.

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