Abstract
Nickel 200 is used in the petrochemical industry in the handling of caustic solutions using a variety of components and equipments made of materials highly resistant to corrosion. However, due to their high costs and their impact on failures by corrosion, it is necessary to resort to other alternative materials that could mitigate this phenomenon. One of them is steel coated with electroless nickel (without passing flow), which in certain situations and under certain conditions offers high resistance. The aim of this study was to evaluate the corrosion resistance of the coated steel test coupons by electroless nickel (EN) in different concentrations of caustic soda and establish the optimal coating thickness for each concentration of NaOH. The chemical analysis conducted by EDX indicates that the composition of coatings in phosphorus compounds are phosphorus by 10.5% and 89.5% nickel with hardnesses average of 550 HV. The corrosion rate in steel EN was in the order between 10.0 and 13.6 μm/yr (25 °C) and 10.2 and 14.7 μm/yr (85 ° C). While for nickel 200 it was in the order between 4.7 and 5.2 μm/yr (25 °C) and 7.0 and 9.9 μm/yr (85 °C). Nickel 200 was comparatively more corrosion resistant than steel coated with electroless nickel, but its cost is higher.
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