Corrosionstability and abrasionstability of Nano-, Micro- functional electrochemical coatings
Abstract
Functional electrochemical coatings: hydrophobic Ni-TiO 2 , catalytic Ni-CeO 2 -CuO, and cutting, abrasive Ni-CBN all need to be durable and corrosion resistant to ensure stability in usage process. The presence of chemically inert nano and micron particles in the composite coatings leads to surface texture change and corrosion resistance increase. TiO 2 nanoparticles are highly hydrophobic, reducing surface moisture condensation and corrosion speed to i Corr =2.23.10 -7 A/dm 2 (1.14.10 -4 mm/year). CeO 2 -CuO nanoparticles are chemically inert, so their presence in Ni-CeO 2 -CuO nanocomposite layers also changes the surface structure, electrochemical and mechanical properties of the matrix. Thus, the corrosion speed also decreases to i Corr. =1.601.10 -5 A/dm 2 (0.1972 mm/year). Similarly, the presence of hard and chemically inert grinding CBN particles in the micro composite coating Ni-CBN also increases the abrasion resistance to the G value of 1789.06, which is equivalent to the Japanese product, and reduces the corrosion speed to i Corr .=7.713.10 -6 A/dm 2 (4.253.10 -2 mm/year).