B30铜镍合金动态条件下在海水中腐蚀与结垢性能研究

Study on Corrosion and Scaling Properties of B30 Cu-Ni Alloy in Seawater Under Dynamic Conditions

对B30铜镍合金在动态条件下的腐蚀与结垢性能进行了实验研究,研究了海水流速、温度以及热流密度变化对于铜镍合金腐蚀与结垢性能的影响。实验结果表明,随着海水流速、温度以及热流密度的增大,B30铜镍合金的腐蚀速率均表现出先增大后减小的趋势,而污垢热阻值则表现出先减小后增大的趋势。海水温度以及换热管热流密度的增大会减小垢层形成的诱导期,但是流速的增大会延长垢层形成的诱导期。在不同海水流速、温度以及热流密度条件下形成的完整的垢层对于B30铜镍合金的垢下腐蚀均有一定的防护作用,但是上述因素的变化主要影响B30铜镍合金的局部点蚀速率,只是在个别时间段对铜镍合金的腐蚀速率产生影响,而且当热流密度达到1000W·m-2时,初期松散的钙质沉积层会促进铜镍合金的局部点蚀速率。

The corrosion and scaling properties of B30 Cu - Ni alloy in dynamic conditions were investigated experimentally. In dynamic experiments to study the water flow rate, temperature, and changes in heat pipe heat flux for copper and nickel alloy corrosion and fouling, the influence of performance under different conditions is discussed relation between corrosion and scaling. The experimental results show that with the increase of seawater flow rate, temperature and heat flux, the corrosion rate of B30 Cu -Ni alloy increases first and then decreases, while the fouling heat resistance decreases first and then increases. The increase of seawater temperature and heat flux of heat transfer pipe will reduce the induction period of scale formation, but the increase of flow rate will prolong the induction period of scale formation. The whole scale layer formed under different seawater flow rate, temperature and heat flux has certain protective effect on the corrosion of B30 Cu - Ni alloy. But the change of above factors mainly affects the local pitting corrosion rate of B30 Cu - Ni alloy. The corrosion rate of Cu - Ni alloy is affected by different time periods, and when the heat flux reaches 1000W · m^- 2, the local pitting rate of Cu - Ni alloy can be accelerated by the initial loose calcium deposit.