Corrosion behaviour of galvannealed steel sheet

Bandyopadhyay, N.; Jha, G.; Singh, Aniket; Rout, Tapan Kumar; Rani, Nitu

doi:10.1016/j.surfcoat.2005.02.153

Cited by 27 publications

(12 citation statements)

References 1 publication

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“…[1][2][3] The quality of the zin nc layer is related to the chemical composition, microstructure and surface condition of steel as well as the chemical composition, the temperature of the zinc bath and the operational conditions, such as immersion time and thermal treatment of the galvanised steel.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of electrochemical stripping of galvannealed interstitial free steels

Paranhos

Lins

Waldemar

et al. 2011

Surface Engineering

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Hot dip galvanised steels with thermal treatment or galvannealed steels are used in automotive industries because of their properties of weldability, workability and corrosion resistance. The galvannealed steels show three iron-zinc phases: zeta, delta and gamma. The distribution and concentration of iron-zinc phases affect the quality of the zinc layer and can produce stamping and welding problems. In the present work, the optimisation study of the electrochemical stripping process of industrial galvannealed steel was performed. The effect of electrolyte, pH, current density and scan rate was evaluated. The best resolution of the potential levels in the electrochemical dissolution curves was obtained for the zinc sulphate heptahydrate and sodium chloride aqueous solution, with a current density of 2 mA cm 22 and pH 4?5. Each sample surface obtained by using electrochemical stripping was analysed using X-ray diffraction and scanning electron microscopy.

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Section: Introductionmentioning

confidence: 99%

Optimisation of electrochemical stripping of galvannealed interstitial free steels

Paranhos

Lins

Waldemar

et al. 2011

Surface Engineering

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“…A solvent composed of distilled water and ethanol (50% / 50% v/v) was prepared and its pH = 4 was adjusted with glacial acetic acid because it does not interfere directly in the hydrolysis for being a weak acid and high volatility [40,41]. At this pH the hydrolysis rate is high and the condensation is minimal, resulting in a solution rich in silanols (Si-OH) which are the agents responsible for adhesion to the metal substrate [9,42].…”

Section: Silanes Solutionmentioning

confidence: 99%

Study of the wettability and the corrosion protection of the hybrid silane (3-aminopropyl) triethoxysilane (APTES) and (3-glycidyloxypropyl) trimethoxysilane (GPTMS) film on galvannealed steel

et al. 2020

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In this work, the wettability of the galvannealed surface pretreated with the hybrid silane APTES/GPTMS film was measured by sessile drop method. The coatings were applied on the substrate from dip-coating method and dried in an oven. The study followed an experimental factorial design, 3³, with contact angle as response. The corrosion resistance was evaluated by electrochemical techniques and the surface morphology was characterized by scanning electron microscopy. The wettability results showed the best condition for galvannealed steel pretreated with the hybrid silane film for 2:1 APTES:GPTMS ratio, 2% silane concentration and 150 min of hydrolysis time, because the result may be related to a higher rate of hydrolysis of the silanes that is influenced by both the functional group present and by the type and number of hydrolyzed groups, resulting consequently in a higher availability of silanol groups in solution, promoting a greater crosslinking of the film on the metallic substrate.

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“…Zn-based coatings due to their durability, cost-effectiveness and strong corrosion resistance are considered as the main protective coatings on a wide range of automotivecompatible steels [22][23][24]. Therefore, Zn-based coatings are considered as a viable alternative for PHS due to their ability to be welded without affecting fusion zone structure [25][26][27][28].…”

Section: A C C E P T E Dmentioning

confidence: 99%

Effect of coating weight on fiber laser welding of Galvanneal-coated 22MnB5 press hardening steel

Razmpoosh

Macwan

Biro

et al. 2018

Surface and Coatings Technology

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Tensile strengths of up to 1.5 GPa and fracture elongation of 8% in press-hardening steel (PHS) opened up a great opportunity to improve the crash performance of vehicles. However, due to the increased susceptibility to welding defects and undesired transformation as a result of coating mixing into the weld pool, laser welding of PHS is still challenging. Hence, the present study focuses on the effect of Galvanneal (GA)coating weight on the microstructure and mechanical performance of fiber laser welded PHS. It was observed that GA-coating weight considerably affects the laser welding process window as well as weld geometry. Weld penetration decreased and concavity increased with increasing coating weight, which is attributed to intensified Zn-plasma and laser interaction at higher coating weights. Moreover, a model has been developed to interpret the correlation between the GA-coating weight of the PHS and the penetration depth based on the heat input per unit thickness of the sheet. The size of fusion zone and heat affected zone decreased slightly with increasing coating weight due to lower energy absorption by the material. Furthermore, GA-coating weight did not affect the tensile strength of all welded joints as the failure happened in the base metal.

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Corrosion behaviour of galvannealed steel sheet

Cited by 27 publications

References 1 publication

Optimisation of electrochemical stripping of galvannealed interstitial free steels

Optimisation of electrochemical stripping of galvannealed interstitial free steels

Study of the wettability and the corrosion protection of the hybrid silane (3-aminopropyl) triethoxysilane (APTES) and (3-glycidyloxypropyl) trimethoxysilane (GPTMS) film on galvannealed steel

Effect of coating weight on fiber laser welding of Galvanneal-coated 22MnB5 press hardening steel

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