材料期刊网

本工作把微机直接控制的恒电位阴极保护电源扩展到多阳极系统。各个阳极通道独立地输出,微机对这些独立电源周期性地依次进行调整,分别按照要求达到恒电位控制。这样,保护对象就能达到较均匀的电位分布。实验室试验表明多至103个通道的控制是可行的。

When a large scale object is to be cathodically protected by impressed current,more than one anodes are usually installed at appropriate places and fed by a single potential controlled rectifier. In many such cases,some anodes may provide excessive current, causing overprotection,while others may bring about underprotection. In fact,different dc voltage is required for every individual anode to offer satisfactory protection.A reasonable solution to this problem is to develop multichannel controller in place of mono-channel controller such as the above-mentioned rectifier.In our previous study,a microcomputer based system for impressed current cathodic protection was established.Potential control was achieved by periodic adjustments of dc power output.In the present study,the new system is extended to multi-anode control.Each anode is driven by its own dc power module,the output of which is controlled independently.During the interval between the successive controls of the same anode channel, the computer can control over other anode channels.Thus in this new system every channel is indepent and can offer appropriate individual output.In this way,more uniform potential distribution can be achieved.Laboratory tests have verified these considerations through computerized 103-channel control system.