通信線路系統材料，通常包含：金屬材料、合金材料、電子接點、高分子材料及水泥建物等。 線路金屬材料與環境之交互作用產生不同型態之腐蝕。 金屬鍍層鋼線廣泛作為電纜之支撐物，在海岸地區此種支撐物經由腐蝕作用在短時間即會發生斷裂的情形。 因此在不同氣候區試驗三種不同鍍層厚度之熱浸鍍鋅鋼絞線、鍍鋁鋼材之大氣腐蝕曝露試驗，並利用多重回歸分析法分析鹽份及氣候因子之關係。 利用噴砂及磨耗試驗模擬海洋環境下，評估鍍鋅及鍍鋁鋼材在噴砂及海洋腐蝕作用下之相關性。 並利用電化學阻抗測試技術，測試鍍鋅、鍍鋁及鍍鋁鋅合金材料，在3%氯化鈉水溶液中之阻抗特性。
為數眾多的鉛被電纜，在台灣作為通信訊號之初級載體已超過二十年以上。 鉛被電纜置放在經常充滿水之人孔環境中，導致其鉛管厚度減少至一定程度時，障礙隨之發生，修護及更換此種設備相當昂貴。 因此應用非破壞性之鋅犧牲陽極工法在舊有鉛被電纜上，成為可行的方式。 除了可靠度外，並分析人孔中有害環境對鉛管之影響。 電子接點及接頭材料對通信者而言，其品質及可靠度相當重要。 本論文中並對鍍金、鍍銀及鍍鎳接點等三種不同鍍層材質，利用混合氣體腐蝕測試法及交流阻抗技術，探討在高溼度及低濃度二氧化硫及二氧化氮之接觸電阻及腐蝕特性。

由大氣腐蝕及磨耗腐蝕試驗研究結果顯示，鍍鋁鋼材在海洋環境下之耐蝕性優於鍍鋅鋼材達60%，鍍鋁鋼材之磨耗特性適用ductile-cutting model。 由電化學阻抗測試發現鍍鋁鋅鋼材與鍍鋁鋼材在海水環境中截然不同的是，鍍鋁鋅鋼材具有Warburg 擴散阻抗之特性，經過一年之曝露試驗後發現鍍鋁與鍍鋁鋅鋼材之電荷轉移阻抗值較高且其改變較鍍鋅鋼材小。 在氣體腐蝕試驗中顯示，鍍金接點在單一的二氧化硫氣體中，接觸電阻最穩定；在二氧化硫與二氧化氮混合氣體中，鍍銀接點則表現最佳，由電子顯微鏡之觀察結果顯示，鍍金、鍍銀及鍍鎳三種接點在上述氣體中均產生孔洞腐蝕現象。

The telecommunication systems outside plant are made of a variety of materials, including metals, alloys, electrical contacts, polymers, concrete structure and so on. The interaction between the outside plant metal components and the environment leads to various types of corrosion. Metal-coated steel wires are widely used as supports for telecommunication cables. In coastal areas the metal-coated steel wire corrodes and even fractures in a short time. Atmospheric corrosion exposure tests were made on three classes of hot-dip galvanizing steel, and aluminum-coated steel wire strands at different environmental sites. A two-step laboratory test, salt spray after sand blast, was designed to simulate windy coastal environments and this test was adopted to evaluate the zinc- and aluminum-coated steel by studying the mutual action of sand abrasion and marine corrosion. Measurements of electrochemical impedance have also been conducted for zinc, aluminum and aluminum-zinc metallic coatings in 3% NaCl aqueous solution.
Numerous lead-sheathed cables have been served as primary carriers of communication signals over twenty years at outside plants of Chunghwa Telecommunication Company (CHT) in the islands of Taiwan. Corrosion of lead-sheathed cables in aggressive flooded manhole’s environments causes a reduction of lead sleeve thickness in the cable sheaths, and when the reduction equals the extreme value of the lead sleeve thickness, failure occurs. Repair and replacement costs are expensive. At the request of CHT, a non-destructive method of applying zinc sacrificial anode cathodic protection (CP) to in-situ lead-sheathed cables has been undertaken. In addition to the reliability, such factors as the manhole’s environmental hazard of lead also analyzed.

The reliability and quality of the electrical contacts and connections are very important for the telecommunication users. This investigation concerns the influence of NO2 and SO2 at low concentration levels in high humid atmospheres on the corrosion of gold, silver and nickel-coated contact materials. The major testing technique includes mixed gas corrosion tests and AC impedance measurements also known as electrochemical impedance spectroscopy (EIS). Contact resistance and corrosion characteristic for the three types of the contacts are investigated and compared.

The results atmospheric corrosion test and erosive wear corrosion test showed that the aluminum-coated steel performed only 60% better than the zinc-coated steel. Also it was found that the erosive wear of zinc and aluminum-coated steels fit a ductile-cutting model. The electrochemical impedance spectroscopy of the aluminum-zinc coating revealed a characteristic Warburg impedance that was absent in compared with that of the aluminum coating. Both aluminum and aluminum-zinc coatings are found with a high charge transfer resistance that changes slightly even standing for one year’s exposure. The results of mixed-gas corrosion test show that the contact resistance was the most stable for gold-plated connector in SO2 atmosphere. But in a mixed SO2 + NO2 accelerated corrosion environments, silver-plated connectors were found to possess the best performance in the contact resistance. The atmosphere of the mixed SO2 and NO2 was found to be more corrosive than that of the single component SO2. All SEM analyses show that the pitting corrosion take place on all three types of the contacts.

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