Journal ArticleDOI
The effects of an Fe–Zn intermetallic-containing coating on the stress corrosion cracking behavior of a hot-dip galvanized steel
Reads0
Chats0
TLDR
In this article, a detailed analysis of galvanized, interstitial free (IF) steel in air and sodium chloride water was carried out, showing a brittle fracture similar to hydrogen embrittlement.Abstract:
This study deals with the mechanical behavior of galvanized, interstitial free (IF) steel in air and sodium chloride water. Tensile tests conducted in air at different strain rates lead in general to a ductile behavior. It can become brittle when tested in a NaCl solution at particular strain rate values. Fractographic analysis shows a brittle fracture similar to hydrogen embrittlement (HE). A detailed analysis taking into account both the individual mechanical strength of the phases on the coating as well as the electrochemical reaction between Zn and water allow the explanation of this embrittlement. Hydrogen can be produced and can penetrate the cracks formed inside the intermetallic phases of the coating during loading, thus, reaching the steel substrate. The HE of the IF steel, assisted by zinc dissolution and galvanized coating low toughness, appears to be the cause of the loss of ductility observed in the presence of specific environmental conditions, strain rates and morphologies of the coating.read more
Citations
More filters
Journal ArticleDOI
A review on recent approaches in the field of hot dip zinc galvanizing process
TL;DR: In this article, the recent developments in the field of hot dip zinc coating are reviewed with special reference to different industrial applications and the improvements in physical and chemical structural composition due to pre- and post-modification processes are discussed.
Journal ArticleDOI
Deformation and Damage Mechanisms of Zinc Coatings on Hot-Dip Galvanized Steel Sheets: Part I. Deformation Modes
Rodolphe Parisot,Samuel Forest,André Pineau,Franç Ois Grillon,Xavier Demonet,Jean-Michel Mataigne +5 more
TL;DR: In this paper, the authors investigated the damage modes at work in three different microstructures of a zinc coating on an interstitial-free steel substrate under tension, planestrain tension, and expansion loading.
Journal ArticleDOI
Wavelet power, entropy and bispectrum applied to AE signals for damage identification and evaluation of corroded galvanized steel
TL;DR: In this paper, a wavelet transform analysis of hot dip galvanized samples with different corrosion levels was carried out, where wavelet power was distributed in different frequency bands, according to damage mechanisms.
Journal ArticleDOI
Coating adherence in galvanized steel assessed by acoustic emission wavelet analysis
TL;DR: In this article, acoustic emission wavelet analysis in scratch tests on hot-dip galvanized samples is compared with optical and electron microscopy observations in order to understand coating features related to adherence and to establish criteria aimed at improving the manufacture process.
Journal ArticleDOI
Al2O3-ZrO2 mixed oxide composite incorporated aluminium rich zinc coatings for high wear resistance
TL;DR: In this article, the incorporation of Al 2 O 3 -ZrO 2 mixed oxide composite in the zinc galvanic coating was achieved by the improvement of corrosion resistance and wear resistance.
References
More filters
Book
Iron-binary phase diagrams
TL;DR: Aufbau der Zweistoff-Legierungen as mentioned in this paper is a monograph of Max Hansen's phase diagram of alloys, published in German in 1939.
Journal ArticleDOI
Modelling of the hydrogen distribution at a crack tip
Abstract: A model has been developed to predict the distribution of hydrogen atoms at a crack tip with the unique feature of incorporation of generalised boundary conditions which account realistically for the electrochemistry-diffusion interface. The use of boundary conditions involving expressions for the flux allows identification of the conditions for diffusion and surface reaction control of hydrogen transport. For ferritic steels, which have a relatively large diffusivity compared with face centred cubic alloys, the model predicts that hydrogen transport is controlled by the kinetics of cathodic generation of hydrogen atoms. The crack-tip concentration is approximately an order of magnitude less than that predicted assuming the conventional constant concentration boundary conditions derived from diffusion controlled transport. The results imply that crack growth rates will be limited by the kinetics of surface reactions and that predictive models of crack growth rates and thresholds for cracking based on diffusion control should be reassessed. The use of generalised boundary conditions also enables the calculation of the time evolution of the hydrogen distribution in initially precharged metals. It is shown that the crack tip and crack walls act as sinks for hydrogen atoms in these circumstances, depleting the hydrogen atoms in the crack-tip region. The loss of hydrogen through the crack tip in precharged samples may affect the location of hydrogen cracking and is an additional factor to be considerred in comparing internal and external hydrogen embrittlement. It also raises questions concerning the meaning of tests on cadmium plated samples because of the loss of hydrogen through the crack tip once the coating has been fractured due to dynamic straining or crack advance.
Journal ArticleDOI
An experimental and theoretical study of the fatigue properties of hot- dip-galvanized high-strength sheet steel
Yngve Bergengren,Arne Melander +1 more
TL;DR: In this paper, the mechanisms behind the reduction of the fatigue strength of high-strength steel owing to hot-dip galvanizing have been studied and three coating thicknesses were considered, ranging from 80 to 220 μm.
Journal ArticleDOI
Residual Stresses in Galvanizing
TL;DR: In this article, the authors determined the residual stresses which promote crack formation and deterioration of corrosion resistance in one-face galvanized specimens by measuring the variation of crack length with applied load resulting from a Vickers small indentation.