Influence of a protective coating slurry on enhancing the descaling ability and oxidation resistance of 9% nickel steel

Abstract

A kind of ceramic slurry was prepared and sprayed onto the surface of 9Ni steel at room temperature. The coating layer will not only reduce the depth of the formed Ni-enriched entanglement at high temperature but also have an excellent ability to resist oxidation of the 9Ni steel. Compared to bare specimen, the depths of the entanglement of the coated 9Ni specimen could be successfully reduced by 74.1% and the oxidation loss be decreased by 62.3% by heating at 1 250 °C for 60min. In addition, the coated specimen indicates no trace of oxide pegs. It proves that the coating has outstanding improvement to internal oxidation resistance. Some characterization methods such as metalloscopy, XRD, XPS, SEM and EDX have been used to reveal a possible protective mechanism. The result shows that the coating layer reacts with the iron oxide to form MgFe₂O₄ on the surface of the coated specimen, which could provide a smaller diffusion coefficient rate of Fe ion. The coating with a low cost and easy implementation is promisingly applicable in the slab-reheating process of the 9Ni steel.

Keywords

9Ni steel / protective coating / oxidation resistance / descaling ability

References

[1] Nippes E, Balaguer J A Study of the Weld Heat-Affected Zone Toughness of 9% Nickel Steel[J]. Weld J., 1986, 65(9): 237

[2] Asai T, Soshiroda T, Miyahara M Influence of Ni Impurity in Steel on the Removability of Primary Scale in Hydraulic Descaling[J]. ISIJ International, 1997, 37(3): 272-727.

[3] Marston H, Ratcliffe R, Steer M, . Tailoring Scale Characteristics During Steel Processing[J]. EUR, 2005 1-255.

[4] Stewart B, Marston H, Zacchetti N, . Control of Scale during Steel Processing[R], 2010

[5] Fukagawa T, Okada H, Maehara Y, Fujikawa H Effect of Small Amount of Nickel on Hydraulic-descaling-ability in Silicon-added Hot-rolled Steel Sheets[J]. Tetsu-to-Hagane, 1996, 82(1): 63-8.

[6] Geneve D, Rouxel D, Pigeat P, . Descaling ability of Low-alloy Steel Wires Depending on Composition and Rolling Process[J]. Corrosion Science, 2010, 52(4): 1 155-1 166.

[7] Melfo W, Bolt H, Rijnders M, . Experimental Study on Primary Scale Formation and Descalability on Steels Containing Ni and Ni+Si[J]. ISIJ International, 2013, 53(5): 866-873.

[8] Lianqi W, Peng L, Shufeng Y, . Preparation and Properties of Antioxidation Inorganic Nano-coating for Low Carbon Steel at an Elevated Temperature[J]. Journal of Wuhan University of Technology-Mater. Sci. Ed., 2006, 21(4): 48-52.

[9] Liu P, Wei L, Ye S, . Protecting Stainless Steel by Glass Coating during Slab Reheating[J]. Surface and Coatings Technology, 2011, 205(12): 3 582-3 587.

[10] Sainz M, Miranzo P, Osendi M Sintering Behaviour and Properties of YAlSiO and YAlSiON Glass-ceramics[J]. Ceramics International, 2011, 37(5): 1485-92.

[11] Wielant J, Goossens V, Hausbrand R, . Electronic Properties of Thermally Formed thin Iron Oxide Films[J]. Electrochimica Acta, 2007, 52(27): 7 617-7 625.

[12] Tiwari S, Sahu RK, Pramanick A, . Development of Conversion Coating on Mild Steel Prior to Sol Gel Nanostructured Al₂O₃ Coating for Enhancement of Corrosion Resistance[J]. Surface and Coatings Technology, 2011, 205(21): 4 960-4 967.

[13] Wang F The Effect of Nanocrystallization on the Selective Oxidation and Adhesion of Al₂O₃ Scales[J]. Oxidation of Metals, 1997, 48(3-4): 215-24.

[14] Chen X, Hou PY, Jacobson CP, . Protective Coating on Stainless Steel Interconnect for SOFCs: Oxidation Kinetics and Electrical Properties[J]. Solid State Ionics, 2005, 176(5): 425-33.

[15] Ecer G, Singh R, Meier G The Influence of Superficially Applied Oxide Powders on the High-temperature Oxidation Behavior of Cr₂O₃-Forming Alloys[J]. Oxidation of Metals, 1982, 18(1–2): 55-81.

[16] Zhou X, Ye S, Xu H, . Influence of Ceramic Coating of MgO on Oxidation Behavior and Descaling Ability of Low Alloy Steel[J]. Surface and Coatings Technology, 2012, 206(17): 3 619-3 625.

[17] Wagner C High Temperature Properties of Metals[J]. American Society for Metals, Cleveland, Ohio, 1951 93

[18] Wagner C Methods of High-Temperature Oxidation Testing and Evaluation of Observations[J]. High Temperature Properties of Metals, 1951 93

[19] Allen GC, Jutson JA, Tempest PA Characterization of Nickel-Chromium-iron Spinel-type Oxides[J]. Journal of Nuclear Materials, 1988, 158: 96-107.

[20] Mittal V, Bera S, Nithya R, . Solid State Synthesis of Mg-Ni Ferrite and Characterization by XRD and XPS[J]. Journal of Nuclear Materials, 2004, 335(3): 302-310.

[21] Fukagawa T, Okada H, Maehara Y Mechanism of Red Scale Defect Formation in Si-added Hot-rolled Steel Sheets[J]. ISIJ international, 1994, 34(11): 906-911.

[22] Blank SL, Pask JA Diffusion of Iron and Nickel in Magnesium Oxide Single Crystals[J]. Journal of the American Ceramic Society, 1969, 52(12): 669-75.

[23] Chen W, Peterson N Effect of the Deviation from Stoichiometry on Cation Self-diffusion and Isotope Effect in Wüstite, Fe1−xO[J]. Journal of Physics and Chemistry of Solids, 1975, 36(10): 1 097-1 103.

[24] Reddy K, Cooper AR Oxygen Diffusion in MgO and α-Fe₂O₃[J]. Journal of the American Ceramic Society, 1983, 66(9): 664-666.