Determine usable coating systems - results of laboratory tests versus long term trials in nature

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Determine usable coating systems - results of laboratory tests versus long term trials in nature

Binder, G.J.

In this study common test methods like salt spray (ISO 7253), as well as cyclic test (NORSOK M-501, ISO 20340) were checked and compared to each other by statistical calculations. By that any relationship between the different tests were figured out. The cycle test according ISO 20340 for offshore structures is relatively new and experiences in practice are limited. Immediately the test procedure indicates that results using this method that only systems with zinc-dust primers passed the test and many well established coating systems failed. The statistical calculations in this work showed, that the test procedure can be shortened by nearly a factor of two to reach comparable results to other accelerated tests and by that time and money will be saved. Results of cycle tests also were compared with test results of long term trials in nature (e.g. immersion and water changing in northern sea). By that procedure acceleration factors of laboratory test were considered. Beneath these tests of rusting of surface further important test parameters for improving the protection behaviour of coating systems under offshore conditions are described in this work.