透過您的圖書館登入
IP:18.222.118.159
  • 學位論文

熱氧化處理對 Inconel 718合金的腐蝕與磨耗腐蝕行為影響研究

Effect of Thermal Oxidation Treatment on the Corrosion andWear-corrosion Behavior of Inconel 718 Alloy

指導教授 : 李正國

摘要


本研究以電鍍技術在Inconel 718合金表面,經過不同溫度及時間熱氧化處理後,再電鍍沉積鎳磷塗層,分析不同塗層結構和硬度值,以及耐腐蝕性和耐磨耗腐蝕性。 實驗中使用Inconel 718合金經過不同溫度(600˚C、700˚C、950˚C)及不同時間(1h、24h、48h、72h)熱氧化處理後,進行電鍍鎳磷塗層,以維克氏硬度量測儀測得塗層之硬度,以燒結氧化鋁(Al2O3)陶瓷環使用塊對環(Block-on-ring)表面磨耗方式,分析耐磨耗腐蝕性,以及使用電化學腐蝕實驗,分析耐腐蝕性,最後用掃描式電子顯微鏡(SEM)和能量散射光譜儀(EDS),分析塗層在腐蝕和磨耗腐蝕前後的表面形態和元素成分。 實驗結果顯示Inconel 718合金,經過不同溫度及不同時間熱氧化處理後再電鍍鎳磷塗層,會有較高的硬度值,較優越的耐磨耗腐蝕性,但也降低了合金鈍態腐蝕保護性而基材經過熱氧化處理後,會提升氧化及鎳磷塗層的緻密性與沉積效率,因此對於表面硬度、耐腐蝕性與耐磨耗腐蝕性,有更好的提升效果。

並列摘要


The purpose of the present study is to evaluate the structure and mechanical properties of the electroplated Ni-P/Oxide composite coatings as well as their effect on the corrosion and wear-corrosion resistance of Inconel 718 alloy in 3.5 wt.% NaCl solution. The thermal oxidation process was performed on Inconel 718 surface with different temperature (600˚C、700˚C、950˚C) and holding time (1h、24h、48h、72h) to enhance the adhesive strength of these composite coatings on Inconel 718 alloy. The surface morphologies and element compositions of the composite coatings before and after all tests are analyzed by scanning electron microscopy (SEM) and X-ray energy dispersive analyzer (EDS). The surface hardness of the specimens was measured by a Vickers′ hardness tester. Electrochemical polarization measurements are performed for analyzing corrosion characteristics, and using the block-on-ring surface friction manner to evaluate the wear-corrosion behavior of these composite coatings in Hanks′ solution. The friction ring counterpart is made of a sintered Al2O3. Experimental results indicated that the anodizing and thermal oxidation treatment could enhance the electroplated Ni-P coating in addition to the electroplated Ni-P/oxide composite coatings. The hardness and wear–corrosion resistance of the electroplated Ni-P/oxide composite coating were improved significantly for Inconel 718 alloy. The thermal oxide treatment during high temperature of 950˚C also enhance the hardness, corrosion and wear-corrosion behavior of Inconel 718 alloy, and were increased with increasing holding time.

參考文獻


參考文獻
1.方治國等編著,機械材料實驗,高立圖書有限公司,臺北,民國九十二年。
2.林冠宇,「熱處理對經過無電鍍鎳處理後之鐵粉的化學組成及結構影響研究」, 國立成功大學,碩士論文,民國九十二年。
3.鎳/鎳磷合金複合電鍍層之製程與機械特性研究 科學與工程技術期刊 第八卷 第一期 民國一○一年 Journal of Science and Engineering Technology, Vol. 8, No. 1, pp. 45-50 (2012) 。
4.高正華,「Pb、Cu 元素對熱壓燒結Al-Si合金磨耗腐蝕行為之影響」,國立中央大學碩士論文,民國九十年。

延伸閱讀