摘要： •Electroless nickel was used as an interlayer for TiAlZrN-coated ductile iron.•The duplex coatings evidently improved corrosion resistance of ductile iron.•The duplex coated ductile iron showed a good erosion resistance. This study utilized electroless nickel (EN) and cathodic arc evaporation (CAE) technologies to deposit protective coatings onto ductile iron. Polarization corrosion tests were performed in 3.5wt.% sodium chloride, and also erosion tests were carried out by using Al2O3 particles (∼177μm in size and Mohr 7 scale) of about 5g. Surface morphologies of the corroded and eroded specimens were observed separately. To further understand the coating effects on both the corrosive and erosive behavior of ductile iron, coating structure, morphology, and adhesion were analyzed using X-ray diffractormeter, scanning electron microscopy, and Rockwell-C indenter, respectively. The results showed that the EN exhibited an amorphous structure while the CAE-TiAlN/ZrN coating was a multilayered nanocrystalline. When the TiAlN/ZrN coated specimen with EN interlayer could effectively increase the adhesion strength between the CAE coating and substrate. Consequently, the combination of TiAlN/ZrN and EN delivered a better performance than did the monolithic EN or TiAlN/ZrN for both corrosion and erosion protection. 出版者： Elsevier B.V 出版日期： 2015-01-01 出處： Applied surface science, 2015-01, Vol.324, p.13-19 版權： 2014 Elsevier B.V. 識別號： ISSN: 0169-4332 識別號： DOI: 10.1016/j.apsusc.2014.10.068
