Cathodic Protection with Sacrificial Anodes

Szabó, S.; Bakos, I.

doi:10.1515/corrrev.2006.24.3-4.231

Cited by 32 publications

(18 citation statements)

References 45 publications

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“…-0.534 V with respect to copper/copper-sulphate electrode is -0.850 V, which means that iron at this potential is in equilibrium with 10 -3 M solution of Fe 2+ ion. In industrial practice iron is considered to be in thermodynamic immunity at this potential [10,11]. (The -0.850 V working potential is NACE standard.…”

Section: Energy Changes Of Charge Transfer Chemical Processesmentioning

confidence: 99%

Metal corrosion and its relation to other fields of science

Szabó¹

2015

Int. J. Corros. Scale Inhib.

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Metal corrosion is a charge transfer process. Study of corrosion and corrosion protection requires manifold knowledge in he field of thermodynamics, reaction kinetics, catalysis, transport and surface phenomena. Dealloying, biocorrosion, corrosion effects of electric traction and energy systems are also very important scientific fields for understanding corrosion. Study and knowledge of metal corrosion and corrosion protection is a very important field of modern research and development, because everybody experiences metal corrosion who use appliances made of metals. The man met with metal corrosion at the dawn of human civilization, but the methods of corrosion protection have been developed very slowly, mostly experientially [1][2][3][4]. The methods developed experientially, step by step became scientifically grounded technologies, in fact, certain technologies were developed on the basis of scientifictechnological development (for instance, cathodic protection or electroplating, etc.). The scientific development of bases of corrosion protection technologies is still going on, and for this reason, these methods become simpler and more effective.The technologies used in the industry never rely on the results of only one scientific field, but apply more or less the results of every scientific field by which the technical level of a given technology can be increased [2,3]. This is also true for metal corrosion, also.The scientific, technical and common language name the process metal corrosion, the result of which at first the surface, later the bulk of the metals, in a result of spontaneous reactions with materials of the environment, undergo chemical changes, therefore, the metal corrosion is a chemical, moreover a charge transfer chemical process (which is very often called anodic process), consequently, the main point of metal corrosion is the losing electrons of metals:where Me z+ can be any product of metal corrosion, 'z' is charge transfer number. Losing electrons can take place in wet environment, or in gas phase for we talk about only

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Section: Energy Changes Of Charge Transfer Chemical Processesmentioning

confidence: 99%

Metal corrosion and its relation to other fields of science

Szabó¹

2015

Int. J. Corros. Scale Inhib.

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“…The protected structure is polarised to a negative electrode potential where the structure is in the region of thermodynamic immunity. Under these conditions equilibrium (10) is overbalanced and a continuous hydrogen deposition may be expected and experienced on the protected structure [73][74][75][76]. The rate of hydrogen deposition depends on the catalytic activity of the surface of a protected structure.…”

Section: The Role Of Hydrogen Deposition In Cathodic Protectionmentioning

confidence: 99%

“…The role of reaction (10) is also very important in the case of cathodic protection with sacrificial anodes [74,76]. Hydrogen deposition on the sacrificial anode is not favourable for this process decreases anode efficiency.…”

Section: The Role Of Hydrogen Deposition In Cathodic Protectionmentioning

confidence: 99%

“…Cathodic protection with sacrificial anodes works well when the exchange current of reaction (10) is the lowest possible, for the loss of anode is lowest in this case. It follows from this that the anode bed has to be protected from any substance which promotes (catalyses) hydrogen deposition [74,76]. (10) plays an important role in electroplating.…”

Section: The Role Of Hydrogen Deposition In Cathodic Protectionmentioning

confidence: 99%

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Reference Electrodes in Metal Corrosion

Szabó

Bakos

2010

International Journal of Corrosion

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With especial regard to hydrogen electrode, the theoretical fundamentals of electrode potential, the most important reference electrodes and the electrode potential measurement have been discussed. In the case of the hydrogen electrode, it have been emphasised that there is no equilibrium between the hydrogen molecule (H 2 ) and the hydrogen (H + ), hydronium (H 3 O + ) ion in the absence of a suitable catalyst. Taking into account the practical aspects as well, the theorectical basis of working of hydrogen, copper-copper sulphate, mercury-mercurous halide, silver-silver halide, metal-metal oxide, metal-metal sulphate and "Thalamid" electrodes, has been discussed.

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“…Song suggested the increase in pH value in the crevice was caused by the reduction of water due to the remaining cathodic current. Although Perdomo et al [13,14] measured potential, pH and oxygen concentration within the crevice for a pipeline steel plate that was pre-corroded in aerated water, the changes in potential and pH of the pipeline steel under disbonded coating subjected to bubbling CO 2 and CP on/off have hardly been reported.…”

Section: Introductionmentioning

confidence: 99%

Effects of cathodic potential on the local electrochemical environment under a disbonded coating

et al. 2008

J Appl Electrochem

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A rectangular crevice assembly was used to investigate the effects of cathodic protection (CP) potential, bubbling CO 2 and surface condition on the crevice corrosion of X70 steel under a disbonded coating. The solution within the crevice becomes more alkaline due to the reduction of dissolved O 2 . As a result, the potential of the steel reaches the protected potential range and thus the protection distance becomes longer when the applied CP potential is more negative. Potential drop (IR) mainly occurs in the vicinity of the opening. However, the introduction of CO 2 into the solution prevents the formation of an alkaline environment but gives rise to an environment with a nearly neutral pH and a uniform potential distribution in the crevice. In addition, it is found that the precorrosion product layer significantly decreases the polarization rate in the crevice.

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Cathodic Protection with Sacrificial Anodes

Cited by 32 publications

References 45 publications

Metal corrosion and its relation to other fields of science

Metal corrosion and its relation to other fields of science

Reference Electrodes in Metal Corrosion

Effects of cathodic potential on the local electrochemical environment under a disbonded coating

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