TO STUDY THE EFFECT OF SILICA BASED YTTRIUM CERIUM HYBRID SOL-GEL COATING ON HOT CORROSION OF BOILER STEEL, MS 210
by Tajinder Singh
Abstract
Hot corrosion is major problem in industrial machinery. It results in major losses in power generation sector. One of the prominent sector is Boiler tubes in fire tube boilers. Various salts like Sodium Sulphate, Sodium chloride and Vanadium Pentoxide contribute to hot corrosion in boiler tubes. To eradicate these problems various types of coatings are being studied and being introduced. Sol-gel technique is relatively new method of coating preparation and with time have proved to be a lot cheaper and reliable when compared to other coating techniques. Instead of using single element of coating, now combination of two or more is being introduced to overcome the limitations of a single element coating. Rare earth elements had also shown good corrosion resistance and they can also be incorporated in combination with other elements. In present research, hybrid sol-gel coating of silica based yttrium cerium was prepared and tested on mild steel MS 210 as mild steel is widely used as boiler tubes material. Bare and coated samples were subjected to cyclic oxidation with molten salt environment. SEM-EDS and X-Ray mapping were done on these specimens. These tests revealed that sol-gel coating is efficient in providing protective coat on specimen under hot corrosion conditions.
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