植物温室钢架外加电流阴极防腐技术的试验研究

分析了植物温室钢架腐蚀条件的特殊性,根据温室内的高温、高湿、化肥、农药以及植物光合作用所产生的高氧和钢架表面存在的酸性导电介质水膜,提出了采用外加电流的阴极保护技术,以选定的保护电位为-850mV、保护电流为80MA/m²的参数进行了有保护试验与无保护对比试验。结果表明,采用阴极外加电流保护后,钢架的腐蚀量几乎为零,未加保护的钢架的年腐蚀率达19.28％。

Experiment and Study on the Cathode Anticorrosive Technology of Additional Electric Current Through Steel Frames of the Plant Greenhouse

This Paper analyses the particularity of the corrosive condition of steel frames of the plant greenhouse. In view of the high temperature, high moisture, chemical fertilizer, pesticide and high oxygen produced by plant photosynthesis and acid water membrane formed on the surface of the steel frames which can conduct electric current, the theory of using additional electric current cathode protection was advanced. In the greenhouse the controlled experiments were made on the basis of parameter of chosen protective volt of-850 mV and protective current of 80 mA/m². The result shows that the corrosive capacity of the steel frames almost equal to naught after using additional electric current protection. However, without protection the corrosive capacity of the steel frames is as 27 times great as that of those protected.