Study On The Corrosion Mechanism And Protective Measures Of Main Material And Protective Cap Of Transmission Tower

Because environmental pollution is an important factor for the corrosion of metal parts of bare poles,it is mainly manifested in the corrosion of the tower body,the corrosion of the grounding network and the corrosion of the ground wire.The main causes of environmental pollution are related to local climate characteristics and industrial emissions.The transmission tower is in contact with the harmful gases in the air,such as SO₂,HCl,CO₂and NH₂.In the humid atmospheric environment,the protective coating of the galvanized steel tower will be consumed rapidly,resulting in the rust of the tower.Transmission line tower,the author of this paper advocate material and protective cap(base)contact part of the conditions to carry out the analysis of corrosion mechanism,corrosion protection measures are put forward,will be able to effectively solve the tower advocate material and protective cap(basic)contact part corrosion problems,ensure the safe operation of transmission lines.Paper of 500 kv line,was Shan He Jia line,Shan He Yi line,He Liu Jia line,He Liu Yi line tower advocate material and protective cap(basic)contact part corrosion condition to carry out the crime scene investigation and sampling,and the soil composition and corrosive medium are analyzed,the results show that the main cause of transmission tower advocate material corrosion is the environment medium corrosion,which are mainly composed of chemical corrosion and electrochemical corrosion,acid corrosion medium in the air caused the surface corrosion of zinc coating material,with the destruction of the zinc coating,corrosion medium anion to advocate material of iron corrosion has played a key role.According to the corrosion condition of the contact part of the main material and the protective cap(foundation)of the tower,the main material shall be strengthened by means of gas protection welding at the bottom of the main material.To advocate material corrosion lighter at the bottom of the tower,in advocate material and foundation combined with protective cap with mixed material,from the tower foot surface from outside introversion,in turn,coated with acrylic resin adhesive,P-11 EF(Roman haas)Megum538glue,outside with glass fiber modified epoxy resin mortar into a protective cap,protective cap at the bottom of the area is consistent with the basic,protective cap formation water outside edge,at the same time,in the protective cap for the surface coated with two layers of anti-seepage coating.After 240h salt spray corrosion test,the surface of the protective cap was free of pitting,crack,blister and corrosion.This paper puts forward the improvement scheme,can effectively avoid the rain in the perimeter of the protective cap residues,even due to the long time running or cover crops around lead to rupture surface impervious coating protective cap,a small amount of water leakage,column foot outside the three layers of protection rubber can also have very good protection effect.