熔射複合表處層之耐蝕及耐磨性研究

1020低碳鋼為工業界廣泛使用的鋼鐵材料，具有價廉與高強度的優點，是結構與機械元件常用的材料，如搭配適當的表面處理技術，將可更為廣泛的運用。台灣地處亞熱帶，氣候多雨潮濕，鋼鐵材料在此較為嚴苛的環境中，表面非常容易因氧化作用，產生腐蝕問題。再者，鋼鐵零組件在許多結合部位、耐磨部位、轉動件或滑動件常因精度要求而不作任何塗裝，以往這些部位常採用電鍍硬鉻的方式來提升鐵鋼材之耐蝕與耐磨性能，但鉻金屬對人體及環境的傷害性非常大，因此鍍硬鉻的取代方法，是目前工業界期待解決的問題。本研究利用熔射法將鋁噴塗在鋼鐵材料表面，形成一防蝕性佳的熔射鋁層，並搭配硬質陽極處理法，於熔射鋁層表面鈍化為一高硬度的氧化鋁層。接著針對鋁熔射/硬質陽極處理複合層的表面機械性質、耐蝕性及耐磨耗性進行相關試驗，並做不同參數的探討。鹽霧試驗結果顯示，鋁熔射/硬質陽極處理複合層試片經鹽水噴霧4000小時後，試片並未產生任何鏽蝕及鼓泡現象，顯示鋁熔射/硬質陽極處理複合層確可提昇鋼材之防蝕性，並已遠遠超越鍍硬鉻之200小時合格標準。微硬度測量結果顯示複合層硬度(Hv 900~1000)高於鍍硬鉻(Hv 800~900)。以電化學試驗、鹽霧試驗及微硬度測量結果等數據作評估，本研究之複合表面處理法可作為業界鍍硬鉻之取代參考方案。

關鍵字

陽極處理；熔射；耐蝕；耐磨

並列摘要

Steel is a kind of structure material in industry. The advantages of steel is cheap and high strength. Steel will more widely use when make a fit process on the surface. The weather in Taiwan is wet whole year. Steel is easily to oxidize in Taiwan. Some combination, rubbing, rotation and slide part in steel materials was always electroplate hard chrome to protection. But unhealthy and environment damage is the inherent defect for electroplate chrome coatings. Anodic materials coated on the steel by thermal spray is a familiar anti-corrosion method. This paper focused on the investigation of the corrosion protection and abrasion resistance properties of thermal spray aluminum/ hard anodic composite coatings. In this study the low carbon steel coated with pure aluminum by arc thermal spray first, and then the specimens recoated by hard anodizing process with sulfuric acid solution. Finally more dense and hard oxidative coatings could be obtained. As a result, The composite coatings specimens in salt fog was no oxidation last for 4000 hr. It showed that the composite coatings possessed good anti-corrosion properties, and better than the standard of electroplate hard chrome(200 hr). The hardness of the composite coatings(Hv 900~1000) is better than the electroplate chrome coatings(Hv 800~900). We suggest the method in this study will replace the coating of electroplate hard chrome.

並列關鍵字

Anti-corrosion ； anodic ； abrasion resistance ； thermal spraying

參考文獻

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國際替代計量

熔射複合表處層之耐蝕及耐磨性研究

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