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| A MICROCOMPUTER-BASED CATHODIC PROTECTION SYSTEM |
| Yang Jinwei Xu Naixin Zhang Chengdian (Shanghai Institute of Mefallurgy Academia Sinica) |
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Abstract A microcomputer based system for impressed current cathodic protection was developed on the basis of the fact that under steady state condition prot- ection potemtial will not change much if voltage of d.c.supply is maintained.Its operating principle is entirely different from that of available industrial potentiostat,in which closed-loop feedback control is continuously executed. Potential control with the new system is achieved by periodic adjustments of d.c.power output.Potential received periodically from a sensing electrode is compared with a preset control value and their difference is fed into an A/D converter.Then the digital signal goes into microcomputer and a result- isng voltage proportional to potential difference is sent to thyristor circuit to correct the d.c.output voltage.Steady state condition is reached by suc- cessive adjustments.The operation of the system was demonstrated by cathodic protection of mild steel at +0.1V vs zinc reference electrode in portable water.When a sampling period of 0.7second was taken,a potential control accuracy of +10 mV was obtained.The most attractive feature of this new design is that it could be easily extended to multi-anode system.Iu this case each anode is driven by its own d.c.power module and is under computer control periodically.
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Received: 25 February 1988
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[1] Britton,J.N.;Holt,R.Corrosion/86． PaPer No.73
[2] pawson.R.L;Benchetrit.G.Corrosion/86． PaPer No.76
[3] Hagcock.E.W.Corrosion/73,PaPer No.69
[4] 朱加符邓天影,金属腐蚀与防护,4,(1979)
[5] 马士德,金属腐蚀与防护,3,(1979) |
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