Mechanism of corrosion protection of hot-dip aluminium–silicon coatings on steel studied by electrochemical depth profiling

Graeve, Iris De; Schoukens, Ine; Lanzutti, A.; Andreatta, F.; Alvarez-Pampliega, A.; Strycker, Joost De; Fedrizzi, L.; Terryn, Herman

doi:10.1016/j.corsci.2013.07.005

Cited by 43 publications

(62 citation statements)

References 24 publications

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“…The electrochemical behavior of the coating was initially evaluated by means of potentiodynamic polarization using an electrochemical micro‐cell . A similar approach was previously followed for the characterization of the protection mechanism of hot‐dip aluminium‐silicon coatings on steel . In order to acquire the polarization curves on the surface exposed at the bottom of the craters, glass micro‐capillaries with internal diameter of 800 μm were employed corresponding to an area of the working electrode of 5 × 10 −3 cm 2 .…”

Section: Methodsmentioning

confidence: 99%

Corrosion protection by zinc‐magnesium coatings on steel studied by electrochemical methods

Andreatta¹,

Rodriguez

Mouanga

et al. 2018

Materials & Corrosion

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The mechanism of corrosion protection of zinc‐magnesium coatings on steel is investigated in this work in order to understand if each layer of the metallic coating is able to provide galvanic protection to the underlying layer and to the steel substrate. Thus, the electrochemical behavior of the metallic coating is studied as a function of the in‐depth structure and composition. The microstructure of each layer is analyzed using the scanning electron microscopy in combination with energy dispersive X‐ray spectroscopy (SEM/EDXS). The electrochemical characterization is carried out by means of electrochemical micro‐cell and scanning vibrating electrode technique (SVET). The corrosion protection mechanism of Zn‐Mg metallic coatings is based on the galvanic protection provided by the Zn‐Mg and Zn layers to the steel substrate. Preferential Mg dissolution in the metallic coating plays an important role in the protection mechanism. Local alkalinization at cathodic sites favors the precipitation of protective Mg‐rich oxides/hydroxides that reinforce the protective corrosion products and therefore could inhibit corrosion processes on the metallic coating and steel substrate.

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Section: Methodsmentioning

confidence: 99%

Corrosion protection by zinc‐magnesium coatings on steel studied by electrochemical methods

Andreatta¹,

Rodriguez

Mouanga

et al. 2018

Materials & Corrosion

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“…For comparison, two different types of aluminized steels were presented in Table 4 from literature [25]. It clearly shows that the corrosion rate of three different Al-alloy coated samples varies closely around 1 mpy.…”

Section: Corrosion Behaviormentioning

confidence: 99%

“…However, if the environment is not mild as that commonly found in marine inland waters, sacrificial protection to the exposed underlying steel may not be sufficient to prevent corrosion where aluminized coating breaks. Similarly, aluminized steel type-1, which is continuously hot-dip coated with aluminum-silicon alloy containing 5-11 wt.% silicon to reduce the hot-dip temperature and minimize iron-aluminum intermetallic thickness [21][22][23], does not only possess sacrificial corrosion property in sulfate solution to protect the underlying steel substrate but also protects transiently in chloride solution [24,25].…”

Section: Introductionmentioning

confidence: 99%

Al–Mg–Mn alloy coating on steel with superior corrosion behavior

Pradhan

Manna

Dutta

2014

Surface and Coatings Technology

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“…Al‐Si clads deposited on aluminum 3XXX alloys have been studied by Ashfar et al In this study, radiofrequency glow discharge optical emission spectroscopy (Rf‐GDOES) was employed to expose layers with different Si content for electrochemical characterization using a microcell. The same experimental procedure was also used for the characterization of hot‐dip aluminum‐silicon coatings on steel . These works highlighted that the combined use of Rf‐GDOES and electrochemical microcell, can provide information on protection mechanisms of diffusion coatings.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and in‐depth electrochemical characterization of Zn diffusion layers on aluminum 3xxx alloy

Lanzutti

Andreatta

Magnan

et al. 2018

Surface & Interface Analysis

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AA 3XXX alloys are widely used in heating, ventilation, and air conditioning (HVAC) field. Diffusion joining using a filler metal together with flux is employed in some applications as for heat exchangers. In this work, the effect of diffusion of a Zn‐based flux on both microstructure and electrochemical behavior has been investigated. In particular, an AA3xxx was coated with a Zn‐rich flux and subjected to controlled atmosphere brazing (CAB). Glow discharge optical emission spectroscopy (GDOES) composition profiles were acquired in order to determine the Zn distribution in the diffusion layer. The GDOES was also employed to produce a controlled erosion of the surface in order to obtain craters with defined depths in the Zn diffusion layer, in which electrochemical analyses could be performed. The Volta potential maps at different depths in the Zn diffusion layer were obtained by scanning Kelvin probe force microscope (SKPFM). The Zn diffusion layer was also investigated by means of Scanning Electron Microscope‐Energy Dispersive X‐ray Spectroscopy (SEM‐EDXS) and the chemical composition of the phases present in the regions was investigated by SKPFM. Finally, the electrochemical microcell was used in the produced craters in order to determine the electrochemical behavior along the Zn diffusion profile. SKPFM and microcell results showed a correlation between the Zn content and the electrochemical properties. In particular, a higher Zn content in the diffusion layer leads to an increase of the Volta potential difference between the intermetallic particles and the matrix. The electrochemical measurements also showed that the Zn diffusion layer provides galvanic protection to the underlaying aluminum alloy.

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Mechanism of corrosion protection of hot-dip aluminium–silicon coatings on steel studied by electrochemical depth profiling

Cited by 43 publications

References 24 publications

Corrosion protection by zinc‐magnesium coatings on steel studied by electrochemical methods

Corrosion protection by zinc‐magnesium coatings on steel studied by electrochemical methods

Al–Mg–Mn alloy coating on steel with superior corrosion behavior

Microstructural and in‐depth electrochemical characterization of Zn diffusion layers on aluminum 3xxx alloy

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