Corrosive resistance of gas-plasma polymeric coatings modified by inorganic additives
Keywords:polymer coatings, gas-flame coating, micro-dimensional filler, concentration and dispersion of the filler, corrosion resistance
Purpose. Evaluation of the corrosion resistance of gas-flame polymer coatings modified with inorganic additives. The research task was to check for corrosion resistance when adding a polymer composite material (PCM) of gas-flame coatings based on polyethylene terephthalate (PET), high-pressure polyethylene (HPPE) and polyamide (PA-6).
Methods. The corrosion resistance of polymer coatings was determined using two methods. One of them is related to the evaluation of the cyclic strength of samples exposed to an aggressive environment in varying degrees. The second method is the measurement of the electrical resistance of a polymer coating.
Findings. It is noted that the appearance of low molecular weight products of thermo-oxidative degradation due to oxidation of polymer particles is a determining factor in the formation of a super molecular structure during the formation of gas-flame coatings. That causes some decrease in their strength protective properties in comparison with cast polymeric materials of the same composition. However, this decrease may be significantly compensated by the introduction of inorganic fillers into the composition of the polymer matrix of the gas-flame coating.
Application field of research. The use of technologies for forming coatings of thermoplastic polymers to protect against corrosion and wear is one of the effective ways to increase the durability of machine parts and structural elements. The coatings formed by dispersed polymers successfully replace paintwork, electroplating and obtained by gumming.
Conclusions. It is shown that the corrosion resistance of a polymer composite material (PCM) in a gas-flame coating depends on the concentration and dispersion of the inorganic filler. In particular, for PCM with a matrix of polyethylene terephthalate and a filler in the form of aluminium powder with a dispersity of 10–20 µm, the maximum corrosion resistance corresponds to a concentration of filler in the amount of 15–20 vol.%. For PCM with the same matrix and a larger filler (pyroceramics dispersion of 100–150 microns) it will correspond to the concentration 10–15 vol.% of filler. The level of corrosion resistance when using more dispersed dispersed filler is higher.
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