本文主要針對結構鋼索外股鋼線，在近海地區受到不同濃度氯鹽環境腐蝕下，塗覆不同潤滑劑對抗腐蝕強度衰退之研究，另外並探討鋼線通過滑輪時，表面的潤滑劑保護鋼索的磨耗作用與其鋼線強度衰減的問題。
電化學動態極化曲線試驗結果顯示，裸線在3.5%NaCl中比在5%NaCl中會有較高的腐蝕電流(Icorr)與較低的腐蝕電位(Ecorr)。
鹽霧試驗結果顯示3.5%及5%NaCl濃度下，裸線與塗覆85W/140齒輪油鋼線，會隨著腐蝕天數增加使試件表面產生嚴重鏽蝕，塗覆潤滑脂因塗覆不均勻會隨著時間增加產生局部區域鏽蝕，塗覆鋼索油的鋼線則有最優異的保護效果。
拉伸試驗結果顯示，在3.5%與5%NaCl鹽霧條件下，裸線與塗覆85W/140齒輪油的鋼線會有最差的極限強度值，並且在試驗第五天與第九天，破斷面均有發現氯與氧元素的內侵，而伸長率仍會隨著試驗天數增加而減少使延性降低；塗覆潤滑脂者則顯示，因塗覆不均造成強度隨著天數增加而緩慢減少；塗覆鋼索油者則有最優異的強度值。
不同荷重磨耗結果顯示，在2kg荷重條件下，裸線與塗覆85W/140齒輪油的鋼線其極限強度已經產生較嚴重衰減，而鋼線表面塗覆鋼索油與潤滑脂者，其極限強度無明顯衰減；在6kg荷重條件下，除了表面塗覆鋼索油之鋼線外，裸線與塗覆其它油品因為接觸表面無邊界膜存在，而使極限強度大幅度衰減。不同的滑動距離磨耗結果顯示，在4.5km的滑動距離時，裸線與塗覆85W/140齒輪油之鋼線其極限強度已經產生較嚴重衰減，鋼線表面塗覆鋼索油與潤滑脂者，其極限強度無明顯衰減現象；在13.5km滑動距離下，除了表面塗覆鋼索油之鋼線外，裸線與塗覆其它油品因為接觸表面無邊界膜存在，而使極限強度大幅度衰減。

This thesis is focused on the corrosion strength of wire ropes after smearing on different lubricants in different salt concentration atmosphere. Also, effects of protective lubricants on wires passing through pulleys and the strength decay phenomena are discussed.
Electrochemical potentiodynamic polarization curve shows that for non-lubricated wires of 3.5% NaCl, the corrosion current (Icorr) was higher with a lower corrosion potential (Ecorr) than 5% NaCl.
The salt-spraying test results reveal that in 3.5% and 5%NaCl, the surfaces of non-lubricated wires and wires with85W/140 gear oil cause more serious corrosion by increasing test days. Non-uniformity of the smearing lubricants causes strength slower reduction by increasing test days. Moreover, surfaces with wire rope oil have the best protective ability.
The tensile test results show that in 3.5% and 5%NaCl, the strength rapidly decline with increasing test days for non-lubricated wires and wires with 85W/140 gear oil. In addition, the oxygen and chlorine elements are found on the fracture surface on the fifth and the ninth days. However, elongation is decreased for ductility decrease with increasing test days. For lubricated wires without uniform smearing cause the strength decrease with increasing test days. Moreover, wires with wire rope oil have the best strength.
Under different load conditions, the results show that under the load of 2kg, non-lubricated wires and wires with 85W/140 gear oil have more serious decay on ultimate tensile strength (UTS), and it is not happened for wires with wire rope oil and grease. Under the load of 6kg, except wires with wire rope oil, there is no existing boundary layer between contact surfaces, and which causes UTS to decrease. Under different sliding distance conditions, at the sliding distance of 4.5km, non-lubricated wires and wires with 85W/140 gear oil have more serious decay on UTS, and wires with wire rope oil and grease do not have significant decay on UTS. At the sliding distance of 13.5km, except wires with wire rope oil, there is no existing boundary layer between contact surfaces, and which causes UTS to decrease.

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