Corrosion Evaluation of Ferritic Stainless Steels for Automotive Exhaust Applications

CORROSION ◽  
10.5006/3319 ◽  
2019 ◽  
Vol 75 (11) ◽  
pp. 1276-1280
Author(s):  
Y. Emun ◽  
H.S. Zurob ◽  
J.R. Kish
Keyword(s):  
Stainless Steels ◽  
Localized Corrosion ◽  
Bench Mark ◽  
Neutral Salt ◽  
Automotive Exhaust ◽  
Metallographic Examination ◽  
Ferritic Stainless Steels ◽  
Corrosion Evaluation ◽  
Corrosion Susceptibility ◽  
Salt Fog

This study compares the localized (exterior) corrosion susceptibility of chromized steel to bench-mark ferritic stainless steels for automotive exhaust applications. Continuous near-neutral salt fog exposure (ASTM B117) was used for this purpose. Corrosion susceptibility was determined using mass loss measurements coupled with a post exposure metallographic examination. Complementary potentiodynamic polarization measurements were made in the bulk salt solution to help interpret the relative performance. The elevated Cr content provided by the chromizing surface treatment provides comparable corrosion resistance to the more highly alloyed ferritic stainless steels studied. The major factor affecting localized corrosion susceptibility is the formation of rust deposits, which act as effective pit-like corrosion initiation sites.

J & L TYPE 409/409 HP

Alloy Digest ◽  
1999 ◽  
Vol 48 (5) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Stainless Steels ◽  
Heat Treating ◽  
Automotive Exhaust ◽  
Ferritic Stainless Steels ◽  
Resistance To Oxidation ◽  
Specialty Steel ◽  
Oxidation And Corrosion

Abstract J and L Types 409 HP are ferritic stainless steels with 11% chromium. They exhibit an excellent combination of good formability, economy, and resistance to oxidation and corrosion. It is typically used in automotive exhaust systems. 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-743. Producer or source: J & L Specialty Steel Inc.

Fatigue–creep behavior of two ferritic stainless steels in simulated automotive exhaust gas and argon

2019 ◽  
Vol 55 (8) ◽  
pp. 3684-3699 ◽  
Author(s):  
Tianlong Liu ◽  
Xiaofei Zhu ◽  
Lijia Chen ◽  
Hongyun Bi ◽  
Yingfei Lin ◽  
...  
Keyword(s):  
Creep Behavior ◽  
Stainless Steels ◽  
Exhaust Gas ◽  
Automotive Exhaust ◽  
Ferritic Stainless Steels

Corrosion Susceptibility in High Temperature Liquid/Vapor Environments of Materials for Tubing of Heavy-Water Collection System in CANDU Nuclear Power Plant

2017 ◽  
Author(s):  
Guangfu Li ◽  
Liang Zhao ◽  
Xinghong Yang
Keyword(s):  
Power Plant ◽  
Heavy Water ◽  
Stainless Steels ◽  
Nuclear Power ◽  
Failure Process ◽  
Localized Corrosion ◽  
304L Stainless Steel ◽  
Water Collection ◽  
Corrosion Susceptibility ◽  
Liquid Vapor

Corrosion especially pitting on the inner surface was regarded as the first step of the failure process of 316L and 304L stainless steel tubes of heavy-water collection systems in CANDU reactors of a power plant. In this work, four materials including the 316L, 304L, carbon steel A106B and Ni-based Alloy 690 were tested in 14 designed liquid/vapor LiOH-containing environments at both 250 and 150°C, to obtain basic information on the corrosion susceptibilities as a function of temperature, media state, Cl− and Li+ contents, for materials selection. Results showed that the corrosion susceptibility rank were A106B at the top, 690 at the bottom and the stainless steels between them. The corrosion susceptibility was lower in a liquid solution than in the vapor above the liquid, and was relatively lower at 150°C than at 250°C for the same media. Chloride promoted corrosion significantly but LiOH showed some protect effect. In the Cl-free solutions at 150°C, A106B exhibited almost no corrosion in the liquid but localized corrosion in the vapor above. It corroded apparently when adding 3%NaCl into the solution or raising temperature to 250°C. The stainless steels showed no corrosion in both the liquid and vapor states of Cl-free solutions at both 150 and 250°C, but exhibiting pitting in the vapor when 3%NaCl added to the solution. 690 always exhibited excellent corrosion resistance during long term tests in various environments.

Creep Behavior of 409L and 436 Ferritic Stainless Steels Applied for Automotive Exhaust System

2013 ◽  
Vol 302 ◽  
pp. 252-257 ◽  
Author(s):  
Huai Yi Chiu ◽  
Chen Ming Kuo ◽  
Huei Sen Wang
Keyword(s):  
Stainless Steel ◽  
Creep Behavior ◽  
Stainless Steels ◽  
Deformation Mechanism ◽  
Exhaust Pipe ◽  
Automotive Exhaust ◽  
Creep Tests ◽  
Ferritic Stainless Steels ◽  
Stress Levels ◽  
Coble Creep

In order to investigate the creep behavior and understand its deformation mechanism of automotive exhaust pipe materials, this study conducted creep experiments of 409L and 436 ferritic stainless steels at both 600°C and 750°C under different stress levels. After creep tests, crept specimens were analyzed on the microstructure and fracture surfaces by the use of scanning electron microscopy. From creep data, two important material coefficients, namely, M of Monkman-Grant relationship and K of Coble creep equation are calculated for predicting the material creep life. Results show the creep resistance of 436 stainless steel is better than that of 409L stainless steel, because the 436 stainless steel has more Ni, Cr, and Mo contents. As the creep mechanism, all tests show grain boundary diffusion or Coble creep is the dominate deformation mechanism, except at higher temperature 750 °C and higher stress levels.

Initiation of Localized Corrosion of Ferritic Stainless Steels by Using the Liquid-Phase Ion Gun Technique

2016 ◽  
Vol 164 (2) ◽  
pp. C1-C7 ◽  
Author(s):  
Jun-Seob Lee ◽  
Takashi Kawano ◽  
Tomohiro Ishii ◽  
Yuichi Kitagawa ◽  
Takayuki Nakanishi ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Stainless Steels ◽  
Localized Corrosion ◽  
Ferritic Stainless Steels

scholarly journals Data on the Corrosion Resistance and Polarization Behaviour of Lean Austenitic and Ferritic Stainless Steels in Neutral Chloride Media

2019 ◽  
Vol 35 (3) ◽  
pp. 1138-1142
Author(s):  
Roland Tolulope Loto
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
Microscopic Analysis ◽  
Localized Corrosion ◽  
Ferritic Stainless Steels ◽  
Anodic Passivation ◽  
Chloride Attack ◽  
316L Steel ◽  
Polarization Behaviour ◽  
Corrosion Pits

Stainless steels are extensively applied in diverse industries due to their exceptional corrosion resistance. The corrosion resistance of alloy stainless steels (316L austenitic and 430Ti ferritic stainless steel) was studied in neutral chloride solutions with chloride concentrations of 1%, 2%, 3%, 4%, 5% and 6%. Their general and localized corrosion resistance were compared and discussed in addition to their passivation characteristics. Corrosion rate results obtained showed 430Ti exhibited slightly greater general resistance to chloride attack compared to 316L. Further investigation showed 316L steel exhibited higher resistance to localized corrosion attack to its resilient passive film. 430Ti exhibited cathodic and anodic passivation compared to 316L which only exhibited anodic passivation. Optical microscopic analysis showed the presence of small, superficial corrosion pits on 316L steel compared to 430Ti, which exhibited deep corrosion pits.

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