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Tuesday, 20 October 2020
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Raw materials & technologies, Production and testing

AC-DC-AC technique for the accelerated evaluation of anticorrosion performances

Thursday, 17 September 2020

A new work explores the use of an AC-DC-AC method for the faster evaluation of the anticorrosion performance provided by anodic films grown on an aerospace aluminium alloy.

The study explores aims at the the faster evaluation of the anticorrosion performance provided by anodic films grown on an aerospace aluminium alloy. Image source: imagii - Pixabay (symbol image).
The study explores aims at the the faster evaluation of the anticorrosion performance provided by anodic films grown on an aerospace aluminium allo...

The test is based on the cyclic application of a cathodic potential step followed by a step of free corrosion and, finally, the measurement of the electrochemical impedance response of the treated surface.

During the cathodic polarisation step in each cycle, alkalinisation is induced on the specimen surface, which results in attack of the porous anodic oxide. The effects of the magnitude and the duration of the cathodic polarisation step are considered, and the impedance responses measured during the various cycles are compared to the responses measured during natural immersion for longer times.

Faster estimation of anticorrosion performance

The methodology is applied for two types of anodic oxides, which are similar for thicknesses but differ for pore morphology and corrosion behaviour. Qualitative correlation is found between the electrochemical testing method and longer term immersion tests at the free corrosion potential, suggesting that the methodology can provide a faster estimation of anticorrosion performance compared to immersion test.

The study has been published in Progress in Organic Coatings, Volume 144, July 2020.

Image source: Pixabay.

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