Corrosion protection of magnesium by electroactive polypyrrole/paint coatings
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Abstract Increasing attention has been focused in recent years upon galvanic anode cathodic protection (CP) for corrosion control of steel in atmospherically exposed concrete. While effectiveness o...
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This research studied the requirement of cathodic protection installation to prevent corrosion on ship in seawater medium, have compared which is often used between Alumunium Cathodic Protection by Zinc Cathodic Protection. KM. ADRI XLIV used as speciment. The comparison results, aluminium sacrificial anodes on KM. ADRI XLIV in field is 108 Kg, higher than result of calculation about 61.58 Kg. So the amount of attached by aluminium sacrificial anodes on KM. ADRI XLIV in field have get safety factor. As comparison the calculation result of Zinc Cathodic Protection requirement, obtained zinc sacrificial anodes weight is 175.59 Kg, higher than aluminium sacrificial anodes.
Keywords : Aluminium Cathodic Protection, Zinc Cathodic Protection.
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To improve sprayed sacrificial zinc anode cathodic protection system, the Federal Highway Administration has sponsored a comprehensive program to develop a new sacrificial alloy for use as an anode to cathodically protect reinforced prestressed concrete structures. Under this program, a new sacrificial aluminum alloy has been developed. This paper presents the results of laboratory and field studies using this alloy.
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This study is to acquire the confirmation data regarding the cathodic protection characteristics for reinforced concrete beam specimens with zinc sacrificial anode in 15% salt water. It was possible to confirm the performance of sacrificial anode cathodic protection system by the measurement of potentials and concrete resistivity for the reinforced concrete beam specimens applied with zinc sacrificial anode in mortar topside of the concrete specimens. The corrosion potential and cathodic protection potential were measured by potentiostat, and 4 hour depolarization potentials were measured after disconnecting with anode for 4 hours. It was confirmed that the cathodic protection for reinforced concrete structures by means of zinc sacrificial anode were very effective corrosion protection technology in marine environments.
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This paper presents an ongoing project regarding Cathodic protection of concrete structures with thermally sprayed sacrificial zinc anodes. The project is divided into two parts: Stage 1 shows the ...
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Various configurations of sacrificial zinc anodes have been successfully used to provide cathodic protection in the tidal zone of steel reinforced concrete structures. Studies conducted by the Florida Department of Transportation have shown that zinc anodes configured in simple fashion can provide long term cathodic protection. These simple systems represent an attractive alternative to conventional cathodic protection where rectifiers are used. This paper discusses a cathodic protection system comprised of zinc sheet anodes used in conjunction with a submerged bulk zinc anode. An overview of long term performance is presented along with estimated service life and costs.
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The importance of sacrificial anode and cathodic protection are illustrated,by analyzing the corrosion of the buried steel pipelines.The method to calculate and install the sacrificial anode and cathodic protection is explained in detail.
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Theoretical and practical information on galvanic corrosion of zinc and its alloys, coupled to other metals, particularly steel, is organized and presented, along with a conceptual and elemental analysis of galvanic coupling between zinc and steel. Various factors which may play roles in galvanic action between zinc and coupled metals are systematically discussed. The principles and practical applications of galvanic protection for steel by zinc coatings, zinc anodes, zincārich paints, and other means are also reviewed. Galvanic corrosion of zinc as well as galvanic corrosion of steel are essentially determined by chemical and electrochemical processes in the system, which is a function of the electrode potentials, reactions involved, metallurgical properties, of the materials, surface conditions, electrolytic properties, and geometric arrangement.
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