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Sunday, 15 September 2019
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Raw materials & technologies, Production and testing

Heating influences the performance of anticorrosive coatings

Tuesday, 24 January 2012

When coatings are applied to industrial equipment, they have to be able to stand the heat produced by solar energy and/or by different conditions on the process. An analysis of the aged films shows what effects occur.

Coatings have to be able to stand the heat produced by solar energy

Source: Bayer MaterialScience

Coatings have to be able to stand the heat produced by solar energy

Source: Bayer MaterialScience

In order to know the behavior of an organic coating at different temperatures, Estefanía Angeles, The National Autonomous University of Mexico (UNAM), Mexico, and her colleagues performed a drying aging cycle by heating on substrate steel and free-of-substrate films during ten uninterrupted days at three and different temperatures: 65, 85 and 100°C. At the end of this period, the researchers analysed the aged films by means of electrochemical impedance spectroscopy (EIS) measurements, thermal analysis (DSC and TGA), Fourier transform infrared spectroscopy (FTIR), and scanning electronic microscopy (SEM). The most critical temperature for the aging was 85°C and "over-cured” phenomenon were observed on the aged films, which were reported by EIS, thermal and IR analyses. They observed these aging conditions and tested them on a very strong and rigid resin containing a barrier pigment. Thus, it can also be applied to other plastic coatings, such as vinyl or alkyd ones, by modifying the temperatures according to glass transition temperature (Tg), as well as the ageing time depending on the hardness and resistance of such coatings and, of course, the protective effect of the pigment. In addition, another aggressive electrolyte, such as synthetic sea water, chloride, sulphide media, as well as inhibitors or ecological pigments could be used in order to predict its behavior in different corrosive media. The study was published in the Pigment & Resin Tech, 2012, 41(1), pp 42-48.
Have a look at the homepage of UNAM

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