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九、表面镀复对导线和孔壁的铜体表面,还需要再镀复一层金等化学性质稳定的金属,以防止铜体表面氧化生锈,影响焊接的可靠性。1.镀复金属的选择金属铜本身的化学稳定性就比较高,在常温下不与干燥空气中的氧化合。如加热,则铜的表面逐渐变黑,即与氧生成CuO。在1100℃时则变为Cu_2O。但在含有CO_2的潮湿空气中,铜的表面则生成绿锈:2Cu+O_2+H_2O+CO_2→Cu(OH)_2CO_3铜是可以耐大气腐蚀的,因为它的标准电极电位很高(+0.345伏),以及它的腐蚀产物[CuCO_3·Cu(OH)_2型或CuSO_4·3Cu(OH)_2型]膜的保护作用(但不是钝化作
Nine, the surface coating on the conductor and hole wall copper body surface, but also need to be coated with a layer of gold and other chemical stability of the metal in order to prevent oxidation of copper surface rust, affecting the reliability of welding. 1. The choice of plating metal Copper metal itself is relatively high chemical stability, at room temperature does not dry air with oxygen. If heated, the surface of the copper becomes darker, that is, with the formation of oxygen CuO. At 1100 ℃ it becomes Cu_2O. However, in the moist air containing CO_2, the surface of the copper produces green rust: 2Cu + O_2 + H_2O + CO_2 → Cu (OH) _2CO_3 Copper is resistant to atmospheric corrosion due to its high standard electrode potential (+0.345 V ), And its corrosion product [CuCO 3 Cu (OH) 2 or CuSO 4 3Cu (OH) 2] (but not passivated