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Home  > Publications  > Blog  > Difficult corrosion testing

Sunday, 27 September 2020

Difficult corrosion testing

Thursday, 8 September 2011 | Posted by: Kirsten Wrede, European Coatings Journal

I have just come back from an international conference on anticorrosive coatings. A lot of topics were discussed, some of which were the advancements of waterborne systems, nanotechnology, and – last but not least – corrosion testing.

As the salt spray test is THE standardised test method used to check corrosion resistance of coated samples, it was surprising to learn: everyone uses the salt spray test, but no one seems to know why! In a workshop on testing methods, the group came up with the thesis that the salt spray test is basically used because the industry is asking for it.

When asked in an audience poll which accelerated testing method they considered the most reliable (salt spray, electrochemical, humidity, filiform, or other), most of the respondees opted for salt spray testing, but then a lot of attendees voted for "other”. When asked what other methods they preferred, one of the respondees suggested that the answer rather meant that none of the mentioned testing methods were considered reliable. Other participants agreed on that. Apparently it is difficult to obtain accurate testing results, no matter what kind of accelerated corrosion test is applied. What is your view on this?

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