A study on the corrosion and erosion behavior of electroless nickel and TiAlN/ZrN duplex coatings on ductile iron

作者：Lin Chung Kwei; Hsu Cheng Hsun^*; Cheng Yin Hwa; Ou Keng Liang; Lee Sheng Long

来源：Applied Surface Science, 2015, 324: 13-19.

DOI：10.1016/j.apsusc.2014.10.068

• Electroless nickel
• TiAlN/ZrN
• Ductile iron
• Corrosion
• Erosion

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 3.5 wt.% sodium chloride, and also erosion tests were carried out by using Al2O3 particles (similar to 177 pm 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.

• 出版日期2015-1-1
• 单位中央民族大学