Effects of Cathodic Protection on Steel Surface in Tidal Zone

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  • 潮の干満部での鋼材に対する電気防食効果
  • シオ ノ カンマンブ デ ノ コウザイ ニ タイスル デンキ ボウショク コウカ

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In order to investigate the effects of cathodic protection on steel surface exposed in tidal zone, the following tests were conducted with mild steel plates.<br>Correlations between immersion time ratios (to total exposure time) and protective effects were investigated for steel plates, of which the potentials were kept within three ranges of -900mV- -1, 000mV, -1, 000mV-1, 100mV and -1, 200mV with reference to sea-water Ag/AgCl electrode by coupling them to galvanic anodes of Zn, Al and Mg.<br>Protective effects were calculated from the difference of weight losses between protected plates and unprotected ones.<br>Results obtained are as follows.<br>1) The protective effects are 95-98% in all the three potential ranges, if the immersion time ratios are above 95%.<br>2) The average protective effects are 50-60% if the immersion time ratios are within the range of 40-90%, but the more negative the potentials, the higher the effects.<br>3) The protective effects are much smaller if the immersion time ratios are below 40%, but in the potentials of -900mV- -1, 000mV the effects are comparatively higher, and so it is necessary to use other corrosion control associated with cathodic protection especially in these environments.

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