Effects of intermediate surface treatments on corrosion resistance of cathodic arc PVD hard coatings

Development of electroless Ni–P/nano-WC composite coatings and investigation on its properties

“…However, due to its relatively limited corrosion resistance L80 is susceptible to corrosion in the service environment. Therefore, many surface treatment methods are applied to improve its corrosion resistance and extend its service life [1][2][3][4][5]. Among various surface techniques, electroless deposition of nickel-phosphorous (Ni-P) is an autocatalytic reduction on metals and alloys, and is considered as an effective method to modify the physical and chemical properties of the substrates.…”

Pre-, intermediate, and post-treatment of hard coatings to improve their performance for forming and cutting tools

“…CrN-based coatings have good corrosion and wear resistance [27,28,29] However, coating defects allow corrosion pitting to occur at localized spots where the coating defects facilitate direct contact of the corrosive species with the base metal [14]. Fig.…”

“…Mechanical surface treatments include micro-blasting [5,6], sand blasting [7], shot peening [8], and/or grinding and polishing [9,10]. Plasma-assisted surface treatments include plasma nitriding [11,12,13], and/or plasma etching [14,15,16]. Surface polishing and plasma nitriding of forming tools can increase both coating adhesion strength and resistance to wear and galling A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 5 [13,12,17].…”

“…However, the intrinsic defects in the coatings allow molten aluminum to interact with the base metal, causing severe localized erosion pitting in these areas, as shown in Figs. 6e and f, and 7d.Micro-blasting and/or argon plasma etching of the coating surface at an intermediate point cleans the coating surface and can prevent formation of pinholes[14].…”

Effects of intermediate Ar plasma treatments on CrN coating microstructures and property evolutions

“…Furthermore, Ar plasma treatment not only enhanced the mechanical properties of TiN/TiCN multilayer films but also led to dense structures and fine grains of films, which contributed to the substantially low friction and high anti‐wear properties compared with the original films . In addition, intermediate treatments could remove the droplets and inclusions of a coating surface, which prevented the generation of local corrosions, blocked the pinholes throughout the coatings and improved the corrosion resistances of CrN coating systems . Otherwise, intermediate ion bombardment of the grown film surface could lead to a great number of defects in the near‐surface area …”