Abstract
This study utilized electroless nickel (EN) and cathodic arc deposition (CAD) technologies to treat the 1wt.% Cu alloyed ductile iron substrates. EN was used as an interlayer, then (Cr,Zr)N coatings were out-layered by using a CAD system. Further, the effect of CAD-(Cr,Zr)N rotation rate and EN on corrosion resistance of the iron was investigated. Coating morphologies and structures were analyzed by using SEM, XRD, and TEM. Polarization test and immersion test were performed to understand corrosion behavior of the iron. The results showed that EN was an amorphous structure while the (Cr,Zr)N film was FCC structure with a multilayered type. After the monolithic EN or/and CAD-(Cr,Zr)N treatments, the coated irons had better corrosion resistance than that of uncoated one. In particular, EN and (Cr,Zr)N at the rotation rate of 2 rpm duplex coatings not only had the best adhesion (HF1), but also evidently improved corrosion resistance in 3.5wt%NaCl and in 10vol%H2SO4, respectively.
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