Structure and Electrochemical Behavior of AlN, AlTiN, and AlTiSiN Physical Vapor Deposition Coatings in 3% NaCl Solution

Dependence of protective effect of Ti1–xAlxN coatings in 3 wt.% NaCl solution on dissolution mechanism of their phases c‐Ti0.5Al0.5N, c‐AlN, and c‐TiN

“…Phase volume fractions, structure, texture, microstresses, and oriented stresses of the crystal lattice, as well as residual mechanical stresses inside the coatings Ti 1-x Al x N and AlN before electrochemical tests were studied on a Shimadzu X-ray diffraction analysis (XRD)-7000 X-ray diffractometer in Cu-Kα radiation at a voltage of 30 kV and a current of 20 μA. [24] The diffraction peaks displacement of phases c-Ti 0.5 Al 0.5 N, α-Fe, and h-WC for the loaded state relative to the unloaded state of the Ti 1-x Al x N coatings was represented by ε Θ . The value of ε Θ was calculated according to formula (1).…”

“…The corrosion behavior of the coatings was evaluated by the corrosion current density i cor , the polarization resistance R p , ). Articles [24] describe the electrochemical preparation of electrodes and the measurements course. The electrode potential is given in accordance with the standard hydrogen electrode.…”

“…[16,18] This shows that the introduction of Al leads to a finer structure or a decrease in crystallinity or even to partial coating amorphization. [24] An h-AlN phase in the Al rich Ti 1-x Al x N coating worsens its conductivity and also reduces corrosion resistance. [7] In addition, the erosion rate of Ti 1-x Al x N coatings with a mixture of hexagonal phases B1 and B4 sharply increases.…”

“…[7] In addition, the erosion rate of Ti 1-x Al x N coatings with a mixture of hexagonal phases B1 and B4 sharply increases. [15] Several works [14,19,24,26] do not connect phase transformations in the Ti-Al-N system with a change in the Al content in it and use powder diffraction files. [27] Three ternary phases, Ti 3 AlN, Ti 2 AlN, and Ti 3 Al 2 N 2 (since 1990), are used for the identification of stoichiometry compounds in Ti-Al-N.…”

“…Ti 1-x Al x N coatings' corrosion resistance depends on structure, thickness, phase composition, Al content, and microdroplets. [9,10,24] In this study, Ti 1-x Al x N coatings were deposited by impulse magnetron sputtering (IMS) and CAE on various substrates to change their stress and structural state at the initial stage of formation, to change phase composition, Al content, and its ratio to Ti, as well as the texture degree. The purpose of the study is to describe the dissolution mechanism of the Ti 1-x Al x N coating in a 3 wt.% NaCl solution, depending on the ratio of the cubic nitride phases c-AlN, c-TiN, and c-Ti 0.5 Al 0.5 N, the intermetallic phase ε-Al 2 Ti, and hexagonal h-Ti metal phase, as well as the element ratio, porosity, total formation energy, residual and oriented stresses, defects, crystallite size, and oxide films composition.…”