Abstract
In this work, the corrosion resistance of hybrid coatings obtained from plastic materials was evaluated and compared with the corrosion resistance of Zn coatings. Zinc and hybrid coatings were obtained by electrodeposition from zinc sulphate electrolyte. For obtained hybrid coatings it was used as disperse phase two type of plastic materials: phenol-formaldehyde resin and epoxy resin. Polarization was used to measure the corrosion rate and behaviour of zinc and hybrid coatings in 3.5% NaCl solution. Tafel curves show that the including particles of plastic materials in zinc matrix disturbs the cathodic reactions and reduces anodic reaction leading to decrease of corrosion current and increase the corrosion resistance of hybrid coatings obtained at the same electrodeposition parameters as zinc coatings. Smallest values of corrosion rate were evaluated for hybrid coatings obtained with phenol-formaldehyde resin as disperse phase that indicates a good corrosion resistance in 3.5% NaCl solution.
Highlights
Hybrid materials are mixtures of two or more components whose properties complement each other, resulting in a material with properties superior to that specific to each component [1]
The excellent performance of zinc coatings lies in the fact that they form dense, adherent films of corrosion products and the corrosion rate is 10 or 100 times lower than that of ferrous materials, the corrosion rate depending on the environment
The aim of this work was to evaluate the behaviour and corrosion resistance in 3.5% NaCl solution of zinc and hybrid coatings with disperse phase plastic materials obtained by electrodeposition in a zinc sulphate electrolyte
Summary
Hybrid materials are mixtures of two or more components whose properties complement each other, resulting in a material with properties superior to that specific to each component [1]. There are a limited number of papers concerning hybrid coatings with plastic materials as disperse phase. For alkaline and marine environments can be used cadmium coatings for o good corrosion protection of steel. The excellent performance of zinc coatings lies in the fact that they form dense, adherent films of corrosion products and the corrosion rate is 10 or 100 times lower than that of ferrous materials, the corrosion rate depending on the environment. For these reasons is necessary to improve the corrosion behaviour of pure zinc coatings using different disperse phase included in the zinc matrix. Phenol formaldehyde resin and epoxy resin are used usually as polymeric coatings because act as a barrier to protect steel from different corrosion environments and are widely used for industrial applications [24,25,26]
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