Protective effect of phosphate-nitrate composition under conditions of corrosion-mechanical destruction of duraluminium surface
DOI:
https://doi.org/10.31734/agroengineering2020.24.115Keywords:
tribocorrosion, duraluminium, phosphate-nitrate composition, protective effectivenessAbstract
The protective effect of the phosphate-nitrate inhibitory composition under the conditions of corrosion-mechanical destruction of the duralumin alloy surface was investigated. Mechanical activation of the metal surface in a corrosive environment was carried out on the installation of unidirectional motion according to the scheme of friction "ball-plane". In the experiment, the researchers used a corrosive environment that simulated acidic precipitation in industrial areas. The method of potentiodynamic polarization proves that the composition based on calcium phosphate and sodium nitrate shows a synergism of protective action. The degree of metal protection from corrosion due to the inhibitor composition is 96 %. No pitting injuries were observed on the surface of alloy at the exposure to solution inhibited by the composition. The addition of the inhibitor to the corrosive solution 1.5 times reduces the coefficient of the ball friction on the aluminum alloy due to formation of a stable phosphate film in the area of the wear track. The composition can be promising for protection against destruction of the surface of products and structures made of aluminum alloys, operated under conditions of friction and the simultaneous influence of a corrosive environment.
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