Oxidation of Low Chromium Steels in Dry and Moist Atmospheres

Date

2017-01-01

Author

Erdoğan, Metehan
Sultan, Abdelrahman
Karakaya, İshak

Metadata

Show full item record

Item Usage Stats

199
views

0
downloads

P-5 (5%Cr) steel is used in the construction of high temperature industrial equipment that works in the flue gas environment because of its high corrosion resistance. However, there are studies reporting higher oxidation rates of Cr containing steels in moist environments when compared to oxidation in air. In order to understand the oxidation behaviour of P-5 steel, isothermal oxidation tests were performed in two different environments; air and flue gas composition of natural gas combustion (CO2+2H2O+7.52N2) using thermogravimetric analysis (TGA) at 450 and 500°C. SEM-EDX and XRD analyses were used in the characterisation of the oxide scales. The results revealed that P-5 possessed better resistance to oxidation in air than in water vapour-containing environment at both temperatures. TGA results of P-5 were used together with the previous data obtained from P-11 (1.25% Cr) and P-22 (2.25% Cr) steels to find a correlation between the oxidation behaviour and Cr content. From the analysis of oxidation data, it was deduced that the corrosion rate in air decreased as the Cr content in the steel increased. However, the corrosion rate increased with the increase in Cr% in the other environment. Formation of chromium rich protective oxide layers on the P-5 and P-22 steel surfaces were used to explain the lower oxidation rates in air. On the other hand, the higher weight gain in the CO2+ 2H2O +7.52N2 environment was attributed to the presence of hydrogen provided by water vapour. It was proposed that hydrogen diffusion into the steel increased the permeability of the oxide scale to oxygen which caused internal oxidation of chromium. As a result, chromium is entrapped inside the steel and the protective nature of the oxide scale is lost.

URI

https://hdl.handle.net/11511/80468
https://www.scopus.com/record/display.uri?eid=2-s2.0-85018392502&origin=resultslist&sort=plf-f&src=s&st1=&st2=&sid=f28d1d732fc4d234d4d3bc2ce05cf2d7&sot=b&sdt=b&sl=77&s=TITLE-ABS-KEY+%28Oxidation+of+Low+Chromium+Steels+in+Dry+and+Moist+Atmospheres%29&relpos=0&citeCnt=0&searchTerm=

Journal

OXIDATION COMMUNICATIONS

Collections

Department of Petroleum and Natural Gas Engineering, Article

Suggestions

OpenMETU
Core

Production and development of aluminide coatings by chemical vapor deposition on nickel based superalloys for turbine engine applications Ertürk, Umutcan; İmer, Muhsine Bilge; Department of Metallurgical and Materials Engineering (2017) Diffusion coatings including aluminide coatings are utilized to improve the high temperature oxidation and corrosion resistance of turbine blades. Through the advancement in the aluminizing methods, higher purity and more homogeneously distributed coatings have been realized. The chemical vapor deposition (CVD) is the most advanced technique utilized for aluminizing process. The versatility of CVD provides a large possibility to control process variables such as temperature, pressure, gas flows and ratios, ...
Use of boron compounds as synergistic flame retardant in low density polyethylene – ethylene vinyl acetate blends and nanocomposites İbibikcan, Esin; Kaynak, Cevdet; Department of Polymer Science and Technology (2013) It is known that for the production of halogen-free cable insulation materials based on polyethylene, very high amounts of traditional metal hydroxide flame retardants such as 65 wt% aluminum hydroxide (ATH) is required to fulfill international directives. Thus, flammability studies investigating synergistic compounds and contribution of nanomaterials have been crucial. Therefore, the first purpose of this thesis was to reveal possible synergism of three boron compounds zinc borate (ZB), boron oxide (BO) an...
Synthesis and structural characterization of Co-Al based superalloys Dinler, Ali Fırat; Mekhrabov, Amdulla O.; Department of Metallurgical and Materials Engineering (2019) Co-based superalloys are commonly used in static components such as stationary vanes because of their superior hot corrosion, oxidation, sulfidation resistance and phase stability at elevated temperatures. They possess relatively lower strength values due to limits in strengthening with solid solution and/or carbide precipitation that makes them unusable for blade and disk applications requiring higher strength values. However, Co-based superalloys with L12 ordered γ’-Co3(Al,W) microstructure has recently d...
Production of nano alumoxane from aluminum hydroxide Sezgiker, Korhan; Gündüz, Güngör; Department of Chemical Engineering (2010) Alumina (Al2O3) is one of the most widely used engineering ceramic. It can be used in a wide range of applications like electrical/thermal insulation, wear resistance, structural refractories, cutting tools, abrasives, catalyst carriers and coatings. A traditional ceramic process has several steps (i.e. powder synthesis and processing, shape forming, drying, organic burnout and densification). Accessing powders with sizes in the range of a couple of micrometers down to several tens of nanometers is consider...
Characterization of Duplex Stainless Steel Weld Metals Obtained by Hybrid Plasma-Gas Metal Arc Welding Yurtışık, Koray; Tirkeş, Süha; Gür, Cemil Hakan; Gürbüz, Rıza (FapUNIFESP (SciELO), 2013-07-01) Despite its high efficiency, autogenous keyhole welding is not well-accepted for duplex stainless steels because it causes excessive ferrite in as-welded duplex microstructure, which leads to a degradation in toughness and corrosion properties of the material. Combining the deep penetration characteristics of plasma arc welding in keyhole mode and metal deposition capability of gas metal arc welding, hybrid plasma - gas metal arc welding process has considered for providing a proper duplex microstructure wi...

Citation Formats

M. Erdoğan, A. Sultan, and İ. Karakaya, “Oxidation of Low Chromium Steels in Dry and Moist Atmospheres,” OXIDATION COMMUNICATIONS, pp. 51–60, 2017, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/80468.