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URN etd-0818109-170653 Statistics This thesis had been viewed 2487 times. Download 786 times. Author Yi-Tsung Chen Author's Email Address No Public. Department Materials Engineering Year 2008 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 109 Title Study on Erodion and Corrosion Behaviors of ADI Coated EN and CAD-TiN Duplex Films Keyword ADI Wet-erosion resistance Corrosion resistance Adhesion resistance Cathodic arc deposition Electroless Nickel plating Electroless Nickel plating Cathodic arc deposition Adhesion resistance Corrosion resistance Wet-erosion resistance ADI Abstract Austempered ductile iron (ADI) made by austempering heat treatment has been widely applied in the industry because it has some dramatic advantages such as high strength, wear resistance, and low cost. However, a lot of hole-defects occurred at the ADI’s surface due to the phenomenon of the spheroidal graphite peeled off, resulting in the deterioration of surface property. In this study, thus, two interlayer types consisting of electroless nickel (EN) and electroless nickel doped carborundum (EN-SiC) were respectively used with the different thickness before the out-layer TiN coating by cathodic arc deposition (CAD) treatment. According to the average size of spheroidal graphite, the interlayer thickness was designed as 5, 15, and 25μm. Then the properties of these duplex coatings such as hardness, adhesion, corrosion resistance, and erosion resistance were all analyzed for exploring the effects of the various interlayer conditions on the surface properties of ADI. The experimental results showed that when the interlayer thickness is up to 25μm regardless of EN and EN-SiC, (1) adhesion of CAD-TiN coating was improved from HF4 to HF; (2) the EN-SiC coated ADI had the best corrosion resistance among all the coated and uncoated conditions after polarization tests in 3.5wt% NaCl solution( 7.95×10-8 VS. 806.76×10-8 ~ 10.07×10-8); (3) the erosion resistance of ADI has raised twice in the performance as compared to uncoated on after wetting erosion tests at an impingement angle of 90˚ and pressure of 0.13 Kg/cm2. Advisor Committee Cheng-Hsun Hsu - advisor
Chung-Kwei Lin - co-chair
Ko-Shao Chen - co-chair
Files Date of Defense 2009-07-20 Date of Submission 2009-08-19