阳树脂粉末对阀冷系统6063铝合金的腐蚀影响研究

通过浸泡实验及电化学实验研究了阳树脂粉末对阀冷系统6063铝合金腐蚀影响。结果表明，直流电流会加速试样腐蚀；阳树脂粉末也会加速阀冷系统6063铝合金腐蚀。阳树脂粉末会溶出有机磺化物与SO₄^2-，有机磺化物可增强溶液的腐蚀性，故浸泡前期腐蚀速率增大；较高浓度的SO₄^2-在一定程度抑制铝合金的腐蚀，导致浸泡后期腐蚀速率减小，但是腐蚀速率仍然较大。电化学实验中6063铝合金自腐蚀电位先降低后升高，自腐蚀电流密度先增大后减小。EIS谱中低频区感抗弧出现，同时容抗弧半径增大，意味着铝合金表面吸附大量的SO₄^2-，在一定程度抑制铝合金的腐蚀。

Effect of Cation Resin Powder on Corrosion Behavior of 6063 Al-Alloy in Valve Cooling System

Effect of the presence of cation resin powder in coolant waters on the corrosion behavior of 6063 Al-alloy was investigated by immersion test and electrochemical test. Results showed that the presence of either an applied direct current or the cation resin powder could enhance the corrosion of the Al-alloy in the valve cooling system. While, organic sulfonates could enhance the corrosiveness of the solution, so the corrosion rate increased in the early stage of immersion. However, higher concentration of SO₄^2- could inhibit the corrosion of Al-alloy to some extent, resulting in the decrease of corrosion rate in the later stage of immersion, even so, the corrosion rate was still larger. The electrochemical tests showed that in the water with cation resin powder, the corrosion potential of 6063 Al-alloy decreased first and then increased, whilst the corrosion current density increased first and then decreased. In the low frequency region of EIS spectrum, inductive arc appeared and the radii of tolerance arc increased, which indicated that a large amount of SO₄^2- adsorbed on the surface of Al-alloy, in other word, the corrosion of Al-alloy was suppressed to a certain extent. Therefore, in the practical application, the troubles related with corrosion of Al-alloy induced by the cation resin powder to 6063 Al-alloy should be considered and the corresponding countermeasures should be taken for the valve cooling system.