本文選題：鎳鎢合金 + 電鍍��； 參考：《表面技術(shù)》2017年07期

【摘要】：目的探究硫酸鹽體系鍍液中檸檬酸濃度、鎢酸鈉濃度及鍍層熱處理工藝,對(duì)鎳鎢合金鍍層中鎢含量、鍍層硬度、鍍層微觀形貌和物相組成的影響。方法采用合金電沉積方法,以低碳鋼為基體,在不同成分的鍍液中制備了一定厚度的鎳鎢合金鍍層,然后用不同的熱處理工藝進(jìn)行后處理。用掃描電鏡(SEM)及其自帶的EDS能譜觀察鍍層的微觀形貌,檢測(cè)鍍層的鎢含量。使用X射線衍射(XRD)分析鍍層的物相組成、晶粒大小和晶格畸變情況。使用顯微硬度計(jì)對(duì)合金鍍層的硬度進(jìn)行了測(cè)試。結(jié)果隨著鍍液中鎢酸鈉濃度的增大或者檸檬酸濃度的減小,鍍層中的鎢含量提高,晶粒尺寸減小,維氏硬度增大。熱處理氛圍對(duì)鍍層硬度的影響不大,但會(huì)改變鍍層微觀形貌,鍍層硬度隨熱處理溫度先增大后減小,也隨保溫時(shí)間先增大后減小。結(jié)論當(dāng)鍍液中含有鎢酸鈉45 g/L,檸檬酸45 g/L,電鍍完成后將鍍層在400℃氬氣保護(hù)下熱處理1.5 h,得到的鍍層是以鎳為溶劑、鎢為溶質(zhì)的置換型固溶體Ni_(17)W_3,其具有表面平整、無裂紋,硬度達(dá)894HV0.1的優(yōu)良性能。
[Abstract]:Objective to investigate the effects of citric acid concentration, sodium tungstate concentration and heat treatment process on the tungsten content, hardness, micromorphology and phase composition of Ni-W alloy coating. Methods Ni-W alloy coatings were prepared by electrodeposition of low carbon steel in different composition bath, and then treated by different heat treatment. Scanning electron microscopy (SEM) and its own EDS energy spectrum were used to observe the microstructure of the coating and to detect the tungsten content of the coating. The phase composition, grain size and lattice distortion of the coating were analyzed by X-ray diffraction (XRD). The hardness of alloy coating was tested by microhardness tester. Results with the increase of sodium tungstate concentration or the decrease of citric acid concentration, the tungsten content, grain size and Vickers hardness increased. Heat treatment atmosphere has little effect on the hardness of the coating, but it will change the microstructure of the coating. The hardness of the coating increases first and then decreases with the heat treatment temperature, and then decreases with the holding time. Conclusion when the bath contains sodium tungstate 45 g / L and citric acid 45 g / L, the coating is annealed in argon atmosphere at 400 鈩，

本文編號(hào)：2101616