Study of BTA Addition on the Wear-Corrosion Behavior of Aluminum Bronze and AISI 4140 Steel in 3.5%NaCl solution

• Main Authors: Hong -Kui Chen, 陳宏魁
• Other Authors: 李正國
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/33871387469377779029

碩士 === 清雲科技大學 === 機械工程系所 === 97 === 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.