La, Sr and Co Based Coatings Obtained on Ferritic Stainless Steel by Dip-Coating Technique

The ferritic stainless steels have been used in applications where suitable properties are required at high temperatures. These metallic materials are applied, for example, as interconnects in ITSOFC fuel cells (600-800 °C).The aim of this work is to produce a La, Sr and Co based coatings using the dip-coating and spray pyrolysis techniques, on an AISI 430 ferritic stainless steel. These coatings are known for acting as barriers, increasing the oxidation resistance when applied on stainless steel at high temperatures. The obtained coatings were heat treated at 800 °C for 120 min, seeking the formation of La0,6Sr0,4Co,and, then characterized regarding their morphology and microstructure using scanning electron microscopy (SEM) and X-ray diffraction. The results showed that the coatings obtained by spray pyrolysis covered regularly the surface while the ones obtained by dip-coating exhibited some crack formation.

Download Full-text

Phases Obtained from Heat Treatment of Mn-Co-Based Coatings Deposited by Dip Coating

Materials Science Forum ◽

10.4028/www.scientific.net/msf.798-799.323 ◽

2014 ◽

Vol 798-799 ◽

pp. 323-327

Author(s):

A. Bervian ◽

Matias Angelis Korb ◽

I.D. Savaris ◽

G.A. Ludwig ◽

L.S. Barreto ◽

...

Keyword(s):

Dip Coating ◽

Solid Oxide ◽

Spinel Type ◽

Ferritic Stainless Steels ◽

Metallic Substrates ◽

Electrolysis Cells ◽

Steel Aisi ◽

Solid Oxide Electrolysis Cells ◽

Dip Coating Technique ◽

Aisi 430

Studies have been performed to improve the oxidation resistance of ferritic stainless steels at high temperatures because these materials have been proposed for the manufacture of interconnectors for solid oxide fuel cell (SOFCs) and solid oxide electrolysis cells (SOECs) operating at intermediate temperatures (IT-SOFCs). Among the coatings employed, ceramic spinel-type oxides have been the most frequently applied. In this context, Mn-Co-based coatings were deposited on ferritic stainless steel (AISI 430) in this study using a dip-coating technique. The obtained coatings were characterized with respect to their morphology by SEM, their elementary composition by EDS and their structure by XRD. It was possible to produce continuous and adherent Mn-Co-based coatings on the surface of the metallic substrates.

Download Full-text

Chromia Evaporation of Ferritic Stainless Steel AISI430 Coated by (La,Sr)CrO3 Perovskite and Mn-Co Oxide Spinel

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.728.166 ◽

2017 ◽

Vol 728 ◽

pp. 166-171

Author(s):

Thamrongsin Siripongsakul ◽

Thublaor Tummaporn ◽

Vatit Prajakesakul ◽

Sorana Kachaban ◽

Somrerk Chandra-ambhorn

Keyword(s):

Stainless Steel ◽

Ferritic Stainless Steel ◽

Sol Gel ◽

Dip Coating ◽

Protective Behavior ◽

X Ray Diffraction ◽

Oxide Spinel ◽

Steel Aisi ◽

Chromium Evaporation ◽

Uncoated Specimen

A ferritic stainless steel has been intensively studied for its potential in application as an interconnect for a solid oxide fuel cell (SOFC). However, at such a high operating temperature chromia in the gaseous phase can contaminate the cathode of the SOFC, and consequently the performance of the device degrades rapidly. To overcome this problem, two kind of ceramics, (La,Sr)CrO3 perovskite and Mn-Co oxide spinel were prepared as coatings on the stainless steel AISI 430 to investigate on chromia evaporation at 800°C. In this present work, the (La,Sr)CrO3 and Co-Mn layers were formed by a sol-gel dip coating and an electrodeposition technique, respectively. The coatings were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), rates of oxidation and rates of chromia evaporation. The coated specimens exhibited the protective behavior with a lower rate of oxidation, as well as a lower rate of chromium evaporation than the uncoated specimen both in the atmosphere of dry and humidified oxygen. But the reduction of the chromia evaporation rates of (La,Sr)CrO3 coatings was insignificant due to the presence of Cr2O3 phase in the coatings.

Download Full-text

Assessment of Properties on AISI430 Ferritic Stainless Steel by Nitriding process

E3S Web of Conferences ◽

10.1051/e3sconf/202018401020 ◽

2020 ◽

Vol 184 ◽

pp. 01020

Author(s):

Lakshmi Deepak Tadepalli ◽

Ananda Mithra Gosala ◽

Lokesh Kondamuru ◽

Sai Chandra Bairi ◽

A. Anitha Lakshmi ◽

...

Keyword(s):

Stainless Steel ◽

Ferritic Stainless Steel ◽

Wear Test ◽

Wear Testing ◽

Variable Load ◽

X Ray Diffraction ◽

X Ray ◽

Good Corrosion Resistance ◽

Pin On Disk ◽

Aisi 430

AISI 430 Ferritic Stainless Steel is well known for its good corrosion resistance applicable for high resistance to pitting and stresses. But it lacks in its wear resistance and hardness in order to improve the mechanical properties of AISI 430 Ferritic Stainless-Steel materials Nitriding Heat Treatment is chosen in this project. The samples are taken in the form of cylindrical shapes with diameter 10mm and length 40mm respectively. The specimen is subjected 4 numbers being the highest treated to saturated limit. One specimen is kept as untreated for comparison purpose. Wear test will be carried out under constant speed and with variable load by pin on disk wear testing apparatus. Finally, all the specimens are subjected to various metallographic tests like SEM (Scanning Electron Microscope) and EDAX (X-ray Despresive Analysis) or XRD (X-ray Diffraction) and the results are compared.

Download Full-text

Recrystallization of Coarse-Grained Nb-Containing AISI-430 Ferritic Stainless Steel

Materials Science Forum ◽

10.4028/www.scientific.net/msf.638-642.3009 ◽

2010 ◽

Vol 638-642 ◽

pp. 3009-3014 ◽

Cited By ~ 1

Author(s):

Rodrigo P. Siqueira ◽

Hugo Ricardo Zschommler Sandim ◽

Tarcisio R. Oliveira

Keyword(s):

Stainless Steel ◽

Ferritic Stainless Steel ◽

Electron Backscatter Diffraction ◽

Secondary Recrystallization ◽

Coarse Grained ◽

Ferritic Stainless Steels ◽

Coarse Grains ◽

Cold Rolled ◽

Backscatter Diffraction ◽

Aisi 430

Ferritic stainless steels (FSSs) have excellent corrosion resistance and good mechanical properties. Applications include heaters, houseware, and automotive exhaust systems. Alloying, even in small amounts, affects the recrystallization behavior of FSSs by selective dragging or pinning effects. In the present study, we present the main results regarding the recrystallization of a coarse-grained Nb-containing AISI 430 ferritic stainless steel. The material was processed by hot rolling and further annealed at 1250oC for 2 h to promote secondary recrystallization. Following, the material was cold rolled to a 80% reduction in thickness and annealed at 400-1000oC for 15 min. Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) were used to characterize the microstructure. Recrystallization of this steel begins at 700oC. Important orientation effects were observed in both as-rolled and annealed conditions. Recrystallization kinetics was strongly dependent on the initial orientation of the coarse grains. Results show that grain boundaries, transition bands and coarse Nb(C,N) particles are preferential sites for nucleation at moderate annealing temperatures.

Download Full-text

Effect of Synergic Controlled Pulsed and Manual Gas Metal ARC Welding Processes on Mechanical and Metallurgical Properties of AISI 430 Ferritic Stainless Steel

Archives of Metallurgy and Materials ◽

10.2478/amm-2013-0122 ◽

2013 ◽

Vol 58 (4) ◽

pp. 1029-1035 ◽

Cited By ~ 4

Author(s):

T. Teker

Keyword(s):

Stainless Steel ◽

Ferritic Stainless Steel ◽

Structural Changes ◽

Gas Metal Arc Welding ◽

Weld Zone ◽

Tensile Tests ◽

X Ray Diffraction ◽

Metal Arc Welding ◽

Welding Processes ◽

Aisi 430

Abstract The gas metal arc is widely used in manufacturing industries because of the high metal deposition rate and ease of automation with better weld quality at permissible cost than other welding processes in joining similar and dissimilar metals. AISI 430 steel is normally difficult to weld by melting methods, due to the associated problems such as grain growth. For this purpose, AISI 430 ferritic stainless steel couples of 10 mm thick were welded by the synergic controlled pulsed (GMAW-P) and manual gas metal arc (GMAW) welding techniques. The interface appearances of the welded specimens were examined by scanning electron microscopy (SEM). Structural changes in the weld zone were analysed by energy dispersive spectrometry (EDS) and X-ray diffraction (X-RD). Microhardness, notch charpy and tensile tests were conducted to determine the mechanical properties of specimens. Accordingly, the best result was obtained from the GMAW-P technique.

Download Full-text

Corrosion Resistant ZrO2 Sol-Gel Coating on Stainless Steel

MRS Proceedings ◽

10.1557/proc-271-471 ◽

1992 ◽

Vol 271 ◽

Cited By ~ 9

Author(s):

M. Atik ◽

M. A. Aegerter

Keyword(s):

Stainless Steel ◽

Sol Gel ◽

Dip Coating ◽

X Ray Diffraction ◽

Corrosion Resistant ◽

Steel Sheets ◽

Chemical Attack ◽

316 L Stainless Steel ◽

Zro2 Sol ◽

Dip Coating Technique

ABSTRACTCorrosion resistant Sol-Gel ZrO2, coatings deposited by dip coating technique on 316 L stainless steel sheets have been fabricated utilizing sonocatalysed precursors sols prepared from zirconium alkoxide Zr(OC3H7)4, isopropanol, glacial acetic acid and water. Their composition varied between 0,025 to 0,9 mol/1 ZrO2. The coatings have been characterized by X-ray diffraction, IR optical reflection, ellipsometry and scanning electron microscopy. When densified under a slow heat treatment thin coatings exhibit outstanding corrosion resistance as no weight change has been observed after 24 h chemical attack in H2SO4 aqueous solution at 81°C and 10 h oxidation treatment in air at 800°C. Thick films as well as films densified under rapid heat treatments tend to crack and are less corrosion resistant.

Download Full-text

AK STEEL 410S

Alloy Digest ◽

10.31399/asm.ad.ss0964 ◽

2006 ◽

Vol 55 (5) ◽

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Physical Properties ◽

Tensile Properties ◽

Ferritic Stainless Steel ◽

High Temperatures ◽

Heat Treating ◽

Austenite Formation ◽

Oxidation Resistant

Abstract AK Steel 410S is a fully ferritic stainless steel with elements added to retard austenite formation at high temperatures. The resulting low hardening allows for use as oxidation-resistant parts. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-964. Producer or source: AK Steel.

Download Full-text