Influence of steel gauge on the microstructure and corrosion performance of zinc alloy coated steels

Sullivan, James; Weirman, Chris; Kennedy, J.G.; Penney, David

doi:10.1016/j.corsci.2010.02.032

Cited by 22 publications

(32 citation statements)

References 19 publications

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“…A summation of these values for all 24 scans per sample then provides a total mass loss. The mathematical procedure for these calculation is fully described elsewhere [4].…”

Section: Manipulation Of Svet Datamentioning

confidence: 99%

In situ monitoring of corrosion mechanisms and phosphate inhibitor surface deposition during corrosion of zinc–magnesium–aluminium (ZMA) alloys using novel time-lapse microscopy

et al. 2015

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In situ time-lapse optical microscopy was used to examine the microstructural corrosion mechanisms in three zinc-magnesium-aluminium (ZMA) alloy coated steels immersed in 1% NaCl pH 7. Preferential corrosion of MgZn(2) lamellae within the eutectic phases was observed in all the ZMA alloys followed by subsequent dissolution of Zn rich phases. The total extent and rate of corrosion, measured using time-lapse image analysis and scanning vibrating electrode technique (SVET) estimated mass loss, decreased as Mg and Al alloying additions were increased up to a level of 3 wt% Mg and 3.7 wt% Al. This was probably due to the increased presence of MgO and Al(2)O(3) at the alloy surface retarding the kinetics of cathodic oxygen reduction. The addition of 1 × 10(-2) mol dm(-3) Na(3)PO(4) to 1% NaCl pH 7 had a dramatic influence on the corrosion mechanism for a ZMA with passivation of anodic sites through phosphate precipitation observed using time-lapse image analysis. Intriguing rapid precipitation of filamentous phosphate was also observed and it is postulated that these filaments nucleate and grow due to super saturation effects. Polarisation experiments showed that the addition of 1 × 10(-2) mol dm(-3) Na(3)PO(4) to the 1% NaCl electrolyte promoted an anodic shift of 50 mV in open circuit potential for the ZMA alloy with a reduction in anodic current of 2.5 orders of magnitude suggesting that it was acting primarily as an anodic inhibitor supporting the inferences from the time-lapse investigations. These phosphate additions resulted in a 98% reduction in estimated mass loss as measured by SVET demonstrating the effectiveness of phosphate inhibitors for this alloy system.

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“…A summation of these values for all 24 scans per sample then provides a total mass loss. The mathematical procedure for these calculation is fully described elsewhere [4].…”

Section: Manipulation Of Svet Datamentioning

confidence: 99%

In situ monitoring of corrosion mechanisms and phosphate inhibitor surface deposition during corrosion of zinc–magnesium–aluminium (ZMA) alloys using novel time-lapse microscopy

et al. 2015

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“…The SVET has been readily used in the investigation of cut edge corrosion in zinc coated and organically coated steels with much success [17][18][19][20][21][22][23][24][25]. [17,18,19,20,21,22,23,24,25]. The SVET probe used in the The apparatus and operation of the technique has been fully described elsewhere [25].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…[17,18,19,20,21,22,23,24,25]. The SVET probe used in the The apparatus and operation of the technique has been fully described elsewhere [25]. The potential gradients detected by the SVET probe in solution are measured in nV and the SVET was calibrated prior to each experiment to convert these measured voltages to current density, Am -2 .…”

Section: Accepted Manuscriptmentioning

confidence: 99%

The effect of ultrasonic irradiation on the microstructure and corrosion rate of a Zn–4.8wt.% Al galvanising alloy used in high performance construction coatings

Sullivan

Penney

Elvins

et al. 2016

Surface and Coatings Technology

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“…Here, a combination of electrochemistry, the scanning vibrating electrode technique (SVET), and time lapse microscopy is used to study the galvanic corrosion of a HSLA steel, typically used during the production of automotive components, laser welded to a UHSS hot stamped boron grade. The SVET technique allows for the measurement of spatially resolved net current density values and subsequently offers scope to study galvanic [19][20] and has previously been used to study the cut edge corrosion of Zn coated steels [21][22][23] .…”

Section: Accepted Manuscriptmentioning

confidence: 99%

The galvanic corrosion of welded ultra-high strength steels used for automotive applications

et al. 2018

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In situ Scanning Vibrating Electrode Technique and time lapse photography were used to study the galvanic corrosion of high strength low alloy (HSLA) steel, laser welded to hot stamped ultra high strength steel (UHSS) in 0.017 M NaCl. Samples of HSLA welded to UHSS exhibited corrosion focused on the UHSS. This galvanic effect was due to a-0.2 V vs. SHE difference in OCP for the UHSS. SVET derived metal loss increased by a factor of >2 for this couple. The localised corrosion observed may reduce the fatigue resistance and is of significance considering the increased use of thinner UHSS.

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Influence of steel gauge on the microstructure and corrosion performance of zinc alloy coated steels

Cited by 22 publications

References 19 publications

In situ monitoring of corrosion mechanisms and phosphate inhibitor surface deposition during corrosion of zinc–magnesium–aluminium (ZMA) alloys using novel time-lapse microscopy

In situ monitoring of corrosion mechanisms and phosphate inhibitor surface deposition during corrosion of zinc–magnesium–aluminium (ZMA) alloys using novel time-lapse microscopy

The effect of ultrasonic irradiation on the microstructure and corrosion rate of a Zn–4.8wt.% Al galvanising alloy used in high performance construction coatings

The galvanic corrosion of welded ultra-high strength steels used for automotive applications

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