苯並三氮唑(BTA)的添加對鋁青銅與AISI4140  鋼在3.5%氯化鈉水溶液中磨耗腐蝕之影響

苯並三氮唑(1,2,3-benzotriazole, BTA)在腐蝕環境中因可與銅生成Cu-BTA膜，而對黃銅具有抑制腐蝕的效果，在工業上常為銅合金構件之最佳腐蝕抑制劑。本研究目的為探討添加BTA對鋁青銅與AISI 4140鋼在滑動接觸下的耐磨耗腐蝕性質之影響。實驗時將圓環狀AISI 4140鋼與塊狀鋁青銅在3.5% NaCl溶液中互相對磨，在固定轉速200rpm下，施加不同的負荷分別為10g、20g、50g與100g，在3.5%NaCl溶液中，再另外加入不同濃度的BTA來觀察對於鋁青銅與鋼材磨耗腐蝕的改善情形。實驗中記錄摩擦力隨時間的變化再計算成摩擦係數(µ)，實驗後量測重量損失，並以掃描式電子顯微鏡觀察鋁青銅與4140鋼之表面破壞形態。實驗結果顯示在3.5%NaCl溶液中，鋁青銅有較優越的耐磨耗腐蝕性，具有較低的磨耗損失，表面只有顯示輕微的機械性磨耗，而4140鋼材則顯現嚴重的磨耗腐蝕破壞。而在添加BTA後，對於鋁青銅與AISI 4140鋼材均有磨耗腐蝕的保護性，高濃度BTA更可顯著地降低摩擦係數與重量損失。之後再分成兩部份，一部份做靜態電化學動態極化曲線實驗得到相同結果證明BTA對鋁青銅及AISI 4140鋼均具有優越的腐蝕保護性，另一部將AISI 4140鋼分別與氧化鋁陶瓷塊對磨，來測量其動態電化學極化，由動態極化所顯示出的數據及曲線也可得知BTA具有良好的腐蝕磨耗抑制能力，而能減少摩擦係數和重量損失。

關鍵字

苯並三氮唑(BTA) ； Cu-BTA膜；腐蝕抑制劑；磨耗腐蝕；摩擦係數(μ)

並列摘要

1,2,3-benzotriazole (BTA) could interact with the surfaces of copper and its alloy to form Cu-BTA film in corrosive environments, and has long been known as an efficient inhibitor for the general corrosion of copper and its alloy in many industry applications. Recently, the occurrence of intergranular corrosion (IGC) of copper in 3.5% NaCl solution in the presence of 1×10-3 M BTA was reported. Both cast and wrought aluminum bronzes offer a good combination of mechanical properties and corrosion resistance. Aluminum bronzes well known for its good sliding properties, is frequently applied as tool material in sheet metal forming (SMF) of stainless steel, e.g. for the production of washing, refrigeration and cooking equipment. The purpose of this study is to investigate the effect of BTA addition with different concentrations (1×10-3 M and 5×10-3 M) on the wear-corrosion protection ability of aluminum bronze sliding against AISI 4140 steel in 3.5% NaCl solution. The wear-corrosion experiment was performed by using a block-on-ring surface friction manner, aluminum bronze as the block and AISI 4140 steel as the friction ring. The wear conditions were under fixed rotation speed of 200 rpm and with different applied normal loads of 10g, 20g, 50g and 100g. The friction force was measured with respect to testing time during wearing test. The friction coefficient (µ) can be calculated by dividing the applied normal load. Also, the wear loss was measured by weighing the specimen before and after the wear-corrosion test. SEM was used to analyze the surface morphology of the specimens after wear-corrosion test. The experimental results indicated that in 3.5% NaCl solution without BTA addition, the friction coefficient and wear loss increased with increasing loads, and aluminum bronze showed the less wear loss than AISI 4140steel. Only a slight mechanical worn surface for aluminum bronze was observed, whereas AISI 4140 steel showed an serious wear-corrosion failure surface. As after BTA adding into 3.5% NaCl solution, both aluminum bronze and AISI 4140 steel exhibited an good ability for wear-corrosion protection. Especially, high BTA concentration showed a significant decrease of friction coefficient and wear loss, and then separate two parts, one is original material proceeding static electrochemistry potentiodynamic experiment that can prove BTA to have superior protection, another part is dynamic electrochemistry to wear with ceramics, and then to measure signal side anti-corrosion, the potentiodynamic show the date and curve, so we can know that BTA have good anti-corrosion and reduce the friction coefficient, weight loss.