Advances in Corrosion Science and Technology: Volume 6 by D. Chatterji, R. C. DeVries, G. Romeo (auth.), Mars G.

By D. Chatterji, R. C. DeVries, G. Romeo (auth.), Mars G. Fontana, Roger W. Staehle (eds.)

This sequence used to be equipped to supply a discussion board for evaluate papers within the region of corrosion. the purpose of those studies is to carry sure parts of corrosion technology and expertise right into a sharp concentration. The volumes of this sequence are released nearly on a every year foundation and every includes 3 to 5 studies. The articles in every one quantity are chosen in this type of manner as to be of curiosity either to the corrosion scientists and the corrosion technologists. there's, actually, a selected goal in juxtaposing those pursuits end result of the value of mutual interplay and interdisciplinarity so very important in corrosion stories. it truly is was hoping that the corrosiori scientists during this manner may perhaps remain abreast of the actions in corrosion expertise and vice versa. during this sequence the time period "corrosion" is utilized in its very broadest experience. It contains, accordingly, not just the degradation of metals in aqueous en­ vironment but additionally what's normally often called "high-temperature oxidation. " additional, the plan is to be much more normal than those issues; the sequence will comprise all solids and all environments. at the present time, engineering solids comprise not just metals yet glasses, ionic solids, polymeric solids, and composites of those. Environments of curiosity has to be prolonged to liquid metals, a large choice of gases, nonaqueous electrolytes, and different non­ aqueous liquids.

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Extra info for Advances in Corrosion Science and Technology: Volume 6

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On the other hand, the pack process is ideal for depositing Al with good control and avoiding porosity. 39 and because Cr coatings deposited from special packs usually exhibit poor bonding characteristics. 37 Pack aluminizing is certainly the most popular coating technique presently available. The major reasons for its popularity are (1) good improvement in surface stability at very reasonable costs; (2) applicability to a wide variety of superalloys; (3) ability to incorporate alloying elements and inert oxide particles when used in conjunction with other techniques; (4) elimination of post-treatments such as annealing; (5) good control of coating chemistry and metallurgy; and (6) ability to handle moderate size pieces of different shapes.

The logic of these suggestions should be clear from the earlier discussions on the importance of Al mobility 42 D. Chatterji. R. C. DeVries. and G. -,,! ~~~: . , .. ,:. SINGLE ::·.. ::,:' -~:";:'::';':'''";':;':-' . :-:. : Ni-DEPLETED (i i ) AI-ENRICHED ZONE ~ ~). }l~ :~. '7' Iii i) DEPLETED ZONE TRANSFORMED TO NiAI - RICH 01 FFUSION ZONE b DURING HEAT TREATMENT Fig. 10. Schematic description of processes occurring during (a) formation of an Ni2Alrtype coating in a pack, (b) heat treatment in an inert environment.

46 D. Chatterji. R. C. DeVries. and G. Romeo (1900-2000°F). Mixed types can and do occur depending on the thermodynamic variables that control Al mobility in a pack. Above discussions did not specify the composition of the superalloy. This is not meant to suggest that the base alloy does not exert any influence on the coating chemistry and metallurgy. In fact, the work of Fleetwood,73 Davin and Cousouradis/ 4 and others 48 ,5o shows clearly that the substrate influences the coating chemistry (and ultimately performance) quite strongly III many cases.

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