| 摘要: | 不鏽鋼彎管在許多產業扮演著至關重要的角色，許多產業需要不鏽鋼彎管道內部表面光滑，而管道內部表面光滑的優勢在於可以更加確保產品的品質、安全性、整潔性以及減少微生物附著的可能性，並可以延長不鏽鋼彎管使用壽命還可以減少維護成本。但是不鏽鋼內彎管的彎曲部分使得一般的抛光方法比較難以接觸到內表面的每個角落，尤其是在彎曲半徑較小的情況下，拋光難度顯著增加。為了解決不鏽鋼彎管拋光的問題本研究使用電化學拋光，並使用具有能夠任意塑形的鎳鈦形狀記憶合金作為電極。
鎳鈦形狀記憶合金具有形狀記憶特性，本研究使用了鎳鈦形狀記憶合金的形狀記憶能力，藉由本研究其能夠記憶成不鏽鋼彎管的形狀。因此將鎳鈦形狀記憶合金應用於電極的角色，進行不鏽鋼彎管內壁的電化學拋光。
由實驗結果顯示，鎳鈦形狀記憶合金當作電極會無法重複使用，電場會直接影響此材料的記憶特性，而導致表面粗糙度不均勻，根據實驗進行調整合適的加工電壓、脈衝時間比、加工時間、電解液溫度，減少對鎳鈦形狀記憶合金電極的損害，並達到拋光效果，並將表面粗糙度變得更加均勻。初始不鏽鋼彎管內壁平均粗糙度為Ra 1.207 µm，經過脈衝電化學拋光後有效將粗糙度降至Ra 0.043 µm。
;Stainless steel bent pipes play a crucial role in various industries where a smooth inner surface is essential. The benefits of a smooth inner surface include enhanced product quality, safety, cleanliness, reduced potential for microbial adhesion, extended pipe lifespan, and reduced maintenance costs. However, the curved sections of stainless steel bent pipes make it difficult for conventional polishing methods to reach all areas of the inner surface, especially when the bending radius is small, significantly increasing the polishing difficulty.
To address the polishing challenges of stainless steel bent pipes, this study utilizes electrochemical polishing and employs nickel-titanium shape memory alloy (NiTi SMA) as the electrode. NiTi SMA has shape memory properties, allowing it to remember and conform to the shape of the stainless steel bent pipe. Thus, NiTi SMA is used as the electrode to perform electrochemical polishing on the inner walls of the stainless steel bent pipes.
Experimental results indicate that NiTi SMA electrodes cannot be reused due to the direct impact of the electric field on the material′s memory properties, leading to uneven surface roughness. By adjusting the processing voltage, duty cycle, processing time, and electrolyte temperature based on experimental findings, damage to the NiTi SMA electrodes can be minimized, achieving a polishing effect and making the surface roughness more uniform. Initially, the average inner surface roughness (Ra) of the stainless steel bent pipe was Ra 1.207 µm. After pulse electrochemical polishing, the roughness was effectively reduced to Ra 0.043 µm. |
