An a.c. impedance study on PVD CrN-coated mild steel with different surface roughnesses

Improvement in corrosion resistance of CrN coated stainless steel by conformal TiO2 deposition

“…However, the protective coatings sometimes fail to prevent corroding of the underlying material that it should protect. This may be related to the presence of pinholes, cracks or grain boundaries in the coatings [5][6][7]. Actually, CrN films prepared by conventional methods like physical vapour deposition, magnetron sputtering, and cathodic arc evaporation sometimes leave pinholes or cracks in the films, which opens possible paths for the corrosive media to attack the substrates that should be protected [5,8].…”

Influence of substrate bias voltage on the microstructure and residual stress of CrN films deposited by medium frequency magnetron sputtering

“…These coatings are generally prepared by various physical vapor deposition techniques, among which medium frequency magnetron sputtering has attracted considerable interest [5][6][7][8]. However, during the reactive direct current (DC) sputtering process, the vacuum chamber can be deposited by an insulative layer which causes "anode vanished".…”

Effects of Surface Preparation on the Corrosion Behavior of Mild Steel

“…As the roughness of the substrate decreased, the number of contours, evidenced by the frequency and size of the initial corrosion sites, also decreased. The exposed area of the substrate is a function of the surface roughness -the higher the area exposed, the more the surface roughness [19]. With all measurements taken, corrosion was clearly reduced with surface modification and spraying.…”