Menu
Search
Filters
Close
Menu

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

51316-7287-Phenomenal Pitting Corrosion on Coating Damaged Surface of Automobile Suspension Coil Springs

Picture for Phenomenal Pitting Corrosion on Coating Damaged Surface of Automobile Suspension Coil Springs
Available for download

This study focuses on a better understanding of significant pitting corrosion on coating surface damaged carbon steels, or low alloy steels, during salt spray testing for automotive applications. Anodic cyclic polarization test was used to evaluate the severity of pitting corrosion, and to estimate the corrosion rate of raw materials.

Product Number: 51316-7287-SG
ISBN: 7287 2016 CP
Author: Yugo Ashida
Publication Date: 2016
Industries: Test Method , Science of Corrosion
$0.00
$20.00
$20.00

This study focuses on a better understanding of significant pitting corrosion on coating surface damaged carbon steels, or low alloy steels, during salt spray testing for automotive applications. Anodic cyclic polarization test was used to evaluate the severity of pitting corrosion, and to estimate the corrosion rate of raw materials. Corrosion potential Ecorr, pitting potential Epit, and pitting protection potential Epp were measured by conducting anodic cyclic potentiodynamic polarization (CPP) on 3 carbon steels. The scattering of the three potentials were observed within 35 mV on a 1 cm2 exposure surface of the 3 steels. To simulate the surface damage on automobile suspension coil springs and stabilizer bars, gravel shocking and a hardness indenter were used to generate damage on ZnP pretreated and coated shot peening surfaces. The corrosion potential evolution of steel substrate, ZnP pretreated surface, and damaged coating surface were monitored in 5% NaCl solution for 72 hours. The timing of pretreatment exposure and metal substrate exposure to the NaCl solution were noticeable. A pitting model and a correlation between pitting occurrence and fatigue cracking are further discussed.

 Key words: downloadable, Carbon steel, automotive, suspension coil spring, stabilizer bar, coating damage, pretreatment, pitting, crevice corrosion, salt spray test, cyclic corrosion test, polarization.

This study focuses on a better understanding of significant pitting corrosion on coating surface damaged carbon steels, or low alloy steels, during salt spray testing for automotive applications. Anodic cyclic polarization test was used to evaluate the severity of pitting corrosion, and to estimate the corrosion rate of raw materials. Corrosion potential Ecorr, pitting potential Epit, and pitting protection potential Epp were measured by conducting anodic cyclic potentiodynamic polarization (CPP) on 3 carbon steels. The scattering of the three potentials were observed within 35 mV on a 1 cm2 exposure surface of the 3 steels. To simulate the surface damage on automobile suspension coil springs and stabilizer bars, gravel shocking and a hardness indenter were used to generate damage on ZnP pretreated and coated shot peening surfaces. The corrosion potential evolution of steel substrate, ZnP pretreated surface, and damaged coating surface were monitored in 5% NaCl solution for 72 hours. The timing of pretreatment exposure and metal substrate exposure to the NaCl solution were noticeable. A pitting model and a correlation between pitting occurrence and fatigue cracking are further discussed.

 Key words: downloadable, Carbon steel, automotive, suspension coil spring, stabilizer bar, coating damage, pretreatment, pitting, crevice corrosion, salt spray test, cyclic corrosion test, polarization.

Product tags
Also Purchased
Picture for Evaluation of Protective Coating Performance in a Cyclic-Temperature Environment
Available for download

51316-7304-Evaluation of Protective Coating Performance in a Cyclic-Temperature Environment

Product Number: 51316-7304-SG
ISBN: 7304 2016 CP
Author: Junki Miyashita
Publication Date: 2016
$20.00

Overview of coatings for a cyclic-temperature environment. Test method, including a heat cycle between 21 to 300 deg-C simulating the dehydrator operation and exposure to salt spray. The performances of the three coatings were evaluated using this method. Factors to be considered for coating selection in the cyclic-temperature environment are discussed.c
Picture for Changes in Test Methodology to Reflect the Changes Within the Oil and Gas Linings Market
Available for download

51316-7312-Changes in Test Methodology to Reflect the Changes Within the Oil and Gas Linings Market

Product Number: 51316-7312-SG
ISBN: 7312 2016 CP
Author: Michael Harrison
Publication Date: 2016
$20.00

Traditional internal lining schemes for the storage/transport of crude oil & refined fuels may no longer be appropriate. The aggressive nature of crude oil (high temp. & more sour), high purity refined products & increased use of biofuels demand better linings & more certain test results. The focus of this paper is to review the trends in test methodology from the early 1990’s to present.
Picture for 03473 PROPOSED STANDARD CARBURIZATION TEST METHOD
Available for download

03473 PROPOSED STANDARD CARBURIZATION TEST METHOD

Product Number: 51300-03473-SG
ISBN: 03473 2003 CP
Author: George Lai, H. Lee Craig, Bingtao Li and Brian Gleeson
Publication Date: 2003
$20.00

A standard carburization test method has been developed that will allow investigators to generate carburization data under uniform, repeatable test parameters and procedures. Test results are discussed with particular reference to test parameters and procedures, as well as the methods of sample evaluation.

 
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support