Impedance Study on the Corrosion of PVD and CVD Titanium Nitride Coatings

Borides in Thin Film Technology

“…However, due to the formation of microscopic (i.e., pinholes) and macroscopic defects (i.e., craters and droplets) in PVD coatings (54,80,81), the substrate surface is not covered entirely without physical discontinuities. Using electrochemical impedance spectroscopy measurements in 1 N sulfuric acid (82), for unalloyed and nitrogen-alloyed ZrB -based coatings (nitrogen-concentration, 22 at.%) porosities of 0.67 and 0.021%, respectively, were obtained (54). This behavior is correlated with the fine-columnar structure favoring voided grain boundaries in unalloyed films and with the dense, fracture-amorphous structure of nitrogenalloyed coatings (compare Fig.…”

Structure, current efficiency, and corrosion properties of brush electrodeposited (BED) Cr from Cr(III)dimethyl formamide (DMF)-bath

“…Using the facts that when determining the porosity, in most cases the cathodic current is negligible, and the current density is inversely proportional to the polarization resistance. Elsener et al [17] estimated the porosity of TiN-coated MS from the shift of the corrosion potential caused by the presence of the coating (DE corr ) and…”

Bioactive coatings prepared by sol–gel on stainless steel 316L

“…where R p is the polarization resistance of the coating, R ps is the polarization resistance of the bare steel, b a is the Tafel slope of the bare stainless steel and DE corr is the difference in corrosion potential between the coated and bare substrate [13,16,17]. Tafel slope was determined from the data of Fig.…”