Corrosion Policy Decision Making. Группа авторов
rel="nofollow" href="#ulink_276d7666-898a-5d3a-a672-3933e76396b6">Figure 2.19. In this comparison, the intervals of periodic visits were only two years.
Figure 2.18 Weak inspection and management.
Full documentation of the operation inspection can significantly reduce paint defects during the service life of the equipment. These documents show compliance with the standards. They show precision at choosing the right paint systems, performing the correct surface preparation, and good application. So, attention paid to proper instructions for the items listed in Figure 2.20 is essential.
Figure 2.19 Rapid development of damage, especially in chemical and marine facilities that are more likely to exhibit paint problems. Defects developed during two years. Documented at May 2009 (left). Documented at October 2011 (right).
Figure 2.20 Effective parameters on paint useful lifespan.
2.3 Conclusion
Science of corrosion is based on understanding three main elements: what metal liberates electrons (thus becomes an anode and is consumed), which material takes electron (and becomes a cathode), and what fluid ions can move through easily. It follows, then, anything that can interrupt one or all of these elements is highly likely to affect corrosion and control it. If, for example, paint (more correctively, coating) is applied, then anode and cathode will not see each other or anode–cathode will be isolated from the external electrolyte; the former will not allow electron transfer and the latter will not allow ion exchange.
In this chapter, three main methods for corrosion prediction (SHE, Galvanic series, and Pourbaix doagrams) as well as categorizing five technical managements of corrosion have been briefly explained. In addition to a short description of each of the five categories, a rather detailed explanation about materials selection and paints has been given to allow the readers a feeling of some of the difficulties involved in technical treatment strategies to deal with corrosion.
References
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11 11 ISO 12944‐Part1 to 8, Paints and varnishes – Corrosion protection of steel structures by protective paint systems. ISI standard, 2017.
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17 17 Bagherzadeh, M.R., Jorsaraie, A., Ghanbarzadeh, A. et al. (2018). Preparation and investigation of anticorrosion performance of water‐based epoxy coating containing nanohybrid of supercritical CO2‐synthesized self‐doped polyaniline – expanded graphite. Journal of Coatings Technology and Research 15: 1–14.
18 18 Akbarinezhad, E., Ebrahimi, M., Sharif, F. et al. (2014). Evaluating protection performance of zinc rich epoxy paints modified with polyaniline and polyaniline‐clay nanocomposite. Progress in Organic Coatings 77 (8): 1299–1308.
19 19 ASTM D4541 – 17 (2017). Standard Test Method for Pull‐Off Strength of Coatings Using Portable Adhesion Testes. West Conshohocken, PA: ASTM International.
20 20 ASTM D2247 – 15 2020 (2020). Standard Practice for Testing Water Resistance of Coatings in 100% Relative Humidity. West Conshohocken, PA: ASTM International.
21 21 ASTM B117 – 19 (2019). Standard Practice for Operating Salt Spray (Fog) Apparatus. West Conshohocken, PA: ASTM International.
Notes
1 * https://www.linkedin.com/in/dr-reza-javaherdashti-9a2a2415.
2 † .https://www.linkedin.com/in/ali-ghanbarzadeh-a5abba55
3 1 Examples in this regards can be that oxidation implies that oxygen is involved or must be involved in the corrosion process. While for many cases it is true, for an even larger number this may not necessarily be taken as a true statement (take, for example, MIC by anaerobic sulfate reducing bacteria). Therefore, it is always better to address electrons giving off reactions as “anodic reactions.” In addition, “corrosion under deposit” does not say anything about the corrosion mechanism(s) involved, it just indicates where corrosion is taking place, which is, of course, under deposits. If the involved corrosion mechanism(s) are not specified, mere use of “under deposit corrosion” is a useless, pseudo‐professional statement. Dissimilar metal corrosion is yet another technically wrong expression; this corrosion process that is correctly referred to as “galvanic corrosion” can happen on the same metals but with different conditions that will make their electrochemical properties become different. Welding a new pipe of smaller