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By Harvey P. Hack

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Data obtained from physical modeling is particularly suited for the computer modeling boundary element mesh (BEM) layout [16] and for the verification of potential and current requirements calculated from polarization data input fed into the model parameters. Where calculations are necessary for potential/current distribution, the computer is particularly beneficial, but reliant on the correct polarization curve to support the result. Additionally, zone interaction and system balancing are not well defined theoretically, but can be studied using a combination of both techniques.

2800 " ,. 004 max. ,~ \ \ ! 400 6()0 8()0 ' 1000 Iron Concentration, p p m Figure 3 - Effect of Added Silicon to the Mercury-Activated Anode be taken in foundry operation such that copper does not enter the melt. The level of copper, therefore, is an important factor on the acquisition of anode grade ingot. SCHRIEBER ON PROTECTION OF MARINE STRUCTURES 47 Table 5 summarizesthe effect of copper, Table 5 - Copper m Aluminum Anodes Metal Characteristics Comment Impurity type Inherent impurity in aluminum ingot.

Aluminum Properties, Metallurgy andPhase Diagrams, American Society of Metals, K. R. , Metals Park, Ohio, 1971, pp. 209-276. , Peterson, M. , and Guanti, R. , "Long Term Performance of Aluminum Anodes in Seawater," Paper No. 277, NACE Corrosion 1989, New Orleans, LA, 1989. [10] Murray, J. , Hays, R. , and Lucas, K. , "Testing Indium-Activated Aluminum Alloys Using NACE TM0190-90 and Long Term Exposures," Paper No. 534, NACE Corrosion 1993, New Orleans, LA, 1993. [11] Willey, L. , Ahtminum Properties, Metalhlrgy and Phase Diagrams.

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