protection against corrosion

How to protect from corrosion underground pipes?

Except use of special covers, there is protection widely applied all over the world — cathodic polarisation. It represents the source of a direct current supplying polar potential min 0,85 In, max — 1,1 V.Stantsija consists only of the usual transformer of an alternating voltage and diodnogo the rectifier.

How many there is a cathodic polarisation?

Cost of devices of cathodic protection depending on their design makes rom one to fourteen thousand roubles. The team of repairmen can easily check polarising potential. Protection installation too does not make the big expenses and is not interfaced to labour-consuming excavations.

What is the electrodrainage?

It is protection of designs against destruction by wandering currents which arise owing to leak from electric chains of a part of a current in soil or water solutions. Therefrom they get on metal designs. In places where the current leaves again these designs in soil or water, there is an anode dissolution of metal or as it is accepted to speak usually, corrosion under the influence of wandering currents. Such zones of destruction of metals under the influence of wandering currents are especially often observed in areas of land electric transport. Wandering currents dissolve metal on anode plots according to law Faradeya. These currents can reach forces in some ampere that leads to the big corrosion destructions. For example, passage of an anode current within one year force in 1 And will cause iron dissolution — 9,1 kg, zinc — 10,7, lead — 33,4 kg.

How to save metal of garage, a roof, tanks for water a transferring method on their surface of ions of zinc?

Advice the Swedish journal «Teknik for alla» has informed. For this purpose first of all the protector is necessary. Its role can play ordinary orebrennyiy brusok from zinc, metal with higher, than at iron, electrode potential. If to fix a protector on a surface of a tin and to connect to metal of garage, a roof, the tank in the presence of electrolit which any water, in effect, is, the electrochemical reaction accompanied by dissolution of zinc and transferring of its ions on the protected surface begins. Thus, the electric chain consisting of elementary galvanic pair "iron-zinc" is received. While the protector will not be dissolved, the iron surface will be inviolable for corrosion.

As protector fastening it is recommended to use usual polyethylene dyubeli for concrete walls: in zinc bruske the aperture is drilled, in it is exhausted dyubel then the protector fastens to a protected zone of metal the usual screw-samorezom.
Material have prepared L.RUDNITSKY, E. ABISHEV, A.ZHUKOV, And. SAHIBZADINOV Source: the Newspaper "Building" #18 (2006) heading «Stroyinform»

It is introduced: on March, 01st, 2007

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