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 evaluation papers within the region of corrosion. the purpose of those experiences is to convey sure parts of corrosion technological know-how and know-how right into a sharp concentration. The volumes of this sequence are released nearly on a every year foundation and every includes 3 to 5 experiences. The articles in every one quantity are chosen in one of these approach as to be of curiosity either to the corrosion scientists and the corrosion technologists. there's, in truth, a selected objective in juxtaposing those pursuits as a result of significance of mutual interplay and interdisciplinarity so very important in corrosion experiences. it really is was hoping that the corrosiori scientists during this approach could remain abreast of the actions in corrosion know-how and vice versa. during this sequence the time period "corrosion" is utilized in its very broadest feel. It comprises, for this reason, not just the degradation of metals in aqueous en­ vironment but in addition what's usually often called "high-temperature oxidation. " extra, the plan is to be much more common than those themes; the sequence will contain all solids and all environments. at the present time, engineering solids contain not just metals yet glasses, ionic solids, polymeric solids, and composites of those. Environments of curiosity has to be prolonged to liquid metals, a wide selection of gases, nonaqueous electrolytes, and different non­ aqueous liquids.

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

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52 . 53 have described several selective etch ants to reveal the identity of phases in pack coatings. One etchant defines the general coating Protection of Superalloys for Turbine Application 33 structure; the P-NiAI phase etches while l' and y phases are unaffected. A second etchant is selective for carbides in the coating and in the base alloy; M6C stains brown, M 23 C 6 varies between green and pale blue tints, and MC is multicolored. Difficulties are sometimes encountered in using extraction and etching techniques to identify unambiguously some phases.

T r ... IUHL:;f:J:{lt· - DEPLETED ~ . :.. ,: " .... ' '.... "'('i~l' , • . ' ZONE TRANSFORMED TO NiAI-RICH DIFFUSION ZONE Fig. 12. Schematic description of processes occurring during formation of an NiAI-type coating. No annealing heat treatment is needed for this type of coating. &" oM; r. "- to -:I .. ;; .... '" Fig. 13. Cross-sectional microstructure of an as-formed NiAl-type coating on IN-738 (540 x ). Successive layers are similar to Fig. II , but lack AI-rich NiAllayer. 46 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. and the effects of temperature on rate controlling steps. However, notwithstanding the inadequacies. the basic features of the mechanistic descriptions by Goward et al.

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