By Olen L. Riggs Jr., Carl E. Locke, Norman E. Hamner (auth.)
The pursuits of this booklet are to provide technical information regarding anodic seasoned tection, clarify how fiscal analyses are made to figure out even if it may be used, and describe the various purposes and gear. Lim itations of the strategy can be mentioned. Technological adjustments that experience led to larger temperatures, pres sures, and velocities bring up corrosion charges and markedly impact fabrics choice and layout judgements. non-stop cycle structures impose elevated calls for on method reliability. New approaches require extra refined gear made from dearer metals that are usually in brief offer and topic to the vagaries of foreign trade. The influence of constant inflation affects judgements with regards to capital charges and upkeep expenses. a few difficulties because of those concerns might be solved, or ideas simplified, by way of anodic security. Technical and clinical details is gifted on purposes to business gear, economics, layout and deploy, operation and upkeep, electrochemical ideas, laboratory checks and approaches. A historic precis, patent record, word list of phrases, and a topic index are incorporated. you will need to recognize that a lot of the knowledge has been from the unique paintings of others, together with the guides of many friends.
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Additional info for Anodic Protection: Theory and Practice in the Prevention of Corrosion
Table 2-1 lists literature references to the installation of anodic protection for sulfuric acid storage tanks, in most of which protection was applied to reduce iron pickup. Results of all installations have been favorable. As an example of this success, Figure 2-6 is a plot of the iron content of oleum stored in an anodically protected vessel for a year. The incoming oleum had an iron content of approximately 40 ppm. Table 2-2 lists the average iron content of 100% sulfuric acid stored in an anodically protected steel tank.
Ind. 33(6),223 (1979), Ca 91, 219238 (1979). E. A. E. Kerrich, Br. Corros. J. 3(9),223 (1968). 3 Equipment for Anodic Protection A typical anodic protection installation in a tank is sketched in Figure 2-9. Figure 2-12 illustrates a heat exchanger that is built with anodic protection as an integral part. Both diagrams show the equipment necessary for anodic protection: cathode and reference electrodes, potential controller, and power supply. This chapter describes the characteristics of this equipment and surveys the systems discussed in the literature, as well as some in the personal experience of the authors.
Cross section of spiral heat exchanger with anodic protection electrodes installed. 28 systems as integral parts of the equipment to replace cast-iron coolers. 28 •29 The first installation of this type was made in 1966 from AISI 304 steel to be used in cooling 93% acid at 66°C. The anodic protection system worked satisfactorily to protect the stainless steel from attack by the acid. Because the plant was located on the shores of the Great Salt Lake and water from the lake was used for cooling, the exchanger failed owing to stress-corrosion cracking caused by chlorides in the cooling water.