The destructive effect of strong concentrations of orthophosphate acid in an acid detergent disinfectant on elements of milking equipment made of stainless steel and aluminum
A huge part of the milking equipment and milk dishes are made of stainless steel and aluminum. Under certain conditions, the influence of such factors as the atmosphere, water, milk, and chemical agents leads to the destruction of metal working surfaces of the milking equipment, resulting in a shorter period of their exploitation. On damaged sites the milk remains are left, that is actually a good nutrient medium, resulting in the creation of conditions for the active development of the microflora. As a result, the following process leads to a marked reduction in disinfectant effect when sanitized. The object of this work was to investigate the influence of various concentrations of orthophosphate acid in an acid detergent disinfectant on the elements of the milking equipment made of stainless steel and aluminum. Accordingly, the result of the conducted research showed that the orthophosphate acid of all four experimental concentrations (20, 25, 30, 35%) in the acid detergent showed a slight destructive effect on stainless steel and was within the standard of corrosion value up to 2 g/m2/year. The increase in the concentration of orthophosphate acid caused a growth in the amount of destruction of stainless steel, which was the highest in the concentration of 35% and amounted to 0.326 g/m2/year. The rate of destruction of stainless steel was in the range from 0.895 ± 0.0036 to 1.712 ± 0.0031 mg/m2/hour and was significantly lower than the norm, which is up to 6.0 mg/m2-year. The magnitude of the destructive action of 20, 25, 30, 35% of the concentration of orthophosphoric acid in an acid mist and disinfectant on the plates of aluminum was higher than the norm, respectively, at 2.42, 2.88, 3.09 and 3.60 times, and the rate of destruction – respectively, at 2.17, 2.63, 2.82 and 3.28 times. Therefore, the addition of a nitric acid ammonium inhibitor in the experimental variants of acidic detergent disinfectant resulted in a decrease in the magnitude of the destruction of aluminum. The results were higher than the norm but were significantly lower (P ≤ 0.05) compared to control, which used «Ecocid», an acid concentration of 30%.
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