Galvanic Corrosion Prevention of Complex Assemblies Through Modeling
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The behavior of galvanic corrosion between carbon steel and CuAlBe with Shape Memory Effect was investigated using the technique of Zero Resistance Amperometry (ZRA), in an electrolytic environment that simulates the water produced from mature oil fields. For this purpose, we used a fractional factorial design 26-2 + 6 central points with the following variables: Cl-, SO4=, S =, HCO3-, ratio of anodic area to cathodic area (1:1, 1:1/2 , 1:1/4) and temperature (25, 35 and 45 °C), where the dependent variable was the galvanic current density measured after 12 h. The results on the response surfaces show evidence of passivation and depassivation, as seen in the nonlinear shape observed in the figures. Therefore, using an experimental design it is possible to study complex chemical equilibrium.
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The various electrochemical techniques for predicting galvanic corrosion behavior of metals are described. Each method is evaluated on the basis of practicality using specific galvanic couples as examples. The paper describes some serious shortcomings of the existing techniques and warns of the dangers of their improper use.
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In view of the universality and severe destructiveness of galvanic corrosion,along with the complexity of influencing factors,the recent progress of galvanic corrosion research was reviewed in respect of influencing factors on galvanic corrosion,such as galvanic potential,cathode/anode area ratio and temperature.This article discussed the problems existing in the current researches and forecasted the future potential developments in the field of the characteristics and mechanism of galvanic corrosion in deep sea environment with low temperature and low dissolved oxygen,the mechanism of galvanic coupling reversal,practical galvanic corrosion prediction model and multi-metal coupling galvanic corrosion.
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This chapter contains sections titled: Introduction Definition Factors in galvanic corrosion Material factors Environmental factors Polarity reversal Preventive measures Beneficial effects of galvanic corrosion Fundamental considerations References
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