Insights into the cut edge corrosion of 55% Al–Zn metal coating on steel from simultaneous electrochemical polarization and localised pH sensing experiments
Source abstract
Abstract
Abstract Band microelectrode arrays were used to model the cut edge corrosion behaviour of 55% Al–Zn (Galvalume/Zincalume) and Zn coated steels in chloride and sulfate electrolytes. Simultaneous electrochemical polarization experiments revealed increased cathodic current on the steel during anodic dissolution of neighbouring Al–Zn alloy electrodes. The increased cathodic current on the steel was shown to be a result of pH buffering by Al3+, enhancing the rate of hydrogen evolution. A large negative shift of the corrosion potential of the Al–Zn alloy electrodes was observed during cathodic polarization on neighbouring steel electrodes and was attributed to alkaline pH generated from cathodic processes.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Corrosion Behavior and Inhibition · Concrete Corrosion and Durability · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (30)
Show source-provided references
1. Galvanic corrosion of zinc and its alloys10.1149/1.1836662 ↗
2. Atmospheric corrosion resistance of skyward- and groundward-exposed surfaces of zinc- and 55% Al–Zn alloy-coated steel sheet10.5006/1.3284884 ↗
3. Zhang · 1996
4. Model electrochemical cell study of cut-edge corrosion inhibition on coil-coated steel sheet by chromate-, phosphate-, and calcium-containing pigments10.1149/1.1381072 ↗
5. Localized electrochemical methods applied to cut edge corrosion10.1149/1.1393954 ↗
6. Investigation of self-healing mechanism on galvanized steels cut edges by coupling SVET and numerical modelling10.1016/j.electacta.2008.02.066 ↗
7. Observation of self-healing functions on the cut edge of galvanized steel using SVET and pH microscopy10.1149/1.2126577 ↗
8. Steel cathodic protection afforded by zinc, aluminium and zinc/aluminium alloy coatings in the atmosphere10.1016/j.surfcoat.2004.04.023 ↗
9. Effect of Al on the galvanic ability of Zn-Al coating under thin layer of electrolyte10.1016/j.electacta.2006.08.050 ↗
10. Effect of Environmental Cation Species on Corrosion near Shear Cut Edge of 55% Al–Zn Alloy Coated Steel Sheet10.2355/isijinternational.49.574 ↗
11. Electrochemical polarization and galvanic couple behaviour of the primary phase of 55% Al–Zn coating investigated using band microelectrodes (BME) and band microelectrode arrays10.1007/s10008-008-0761-6 ↗
12. Developing an iridium oxide film modified microelectrode for microscale measurement of pH10.1002/elan.200603753 ↗
13. Preparation of an oxidized iridium electrode and the variation of its potential with pH10.1016/S0022-0728(84)80045-5 ↗
14. Evaluation of iridium oxide electrodes formed by potential cycling as pH probes10.1039/an9881300035 ↗
15. Considerations of the pH-dependence of hydrous oxide-films formed on iridium by voltammetric cycling10.1002/elan.1140040306 ↗
16. Electrochemical polarization studies of BS 4360 50D steel in 3.5% NaCl10.1016/0010-938X(82)90046-4 ↗
17. The kinetics and mechanism of cathodic oxygen reduction on zinc and zinc-aluminium alloy galvanized coatings10.1016/j.corsci.2005.05.036 ↗
18. Corrosion and polarization characteristics of zinc in neutral-acid media – I. Pure zinc in solutions of various sodium salts10.1016/0013-4686(79)87048-6 ↗
19. The influence of pH on the corrosion of medium strength aerospace alloys 8090, 2091 and 201410.1016/0010-938X(92)90102-9 ↗
20. On the mehcanism of the passivity of Aluminum and Aluminum-Alloys10.1016/0022-0728(93)80186-L ↗
21. Effects of buffers on hydrogen evolution at iron electrodes10.1016/0013-4686(84)87171-6 ↗
22. The active iron electrode I. Iron dissolution and hydrogen evolution reactions in acidic sulfate solutions10.1149/1.2423480 ↗
23. Cathodic reactions on an iron RDE in the presence of Y(III)10.1149/1.2958299 ↗
24. Influence of Fe-rich intermetallic inclusions on pit initiation on aluminum alloys in aerated NaCl10.1149/1.1391637 ↗
25. Distribution of pH during galvanic corrosion of a Zn/steel couple10.1016/j.electacta.2003.10.012 ↗
26. Mechanistic study of cathodic electrodeposition of zinc oxide and zinc hydroxychloride films from oxygenated aqueous zinc chloride solutions10.1149/1.1838359 ↗
27. The protective nature of passivation films on zinc: surface charge10.1016/j.corsci.2004.01.002 ↗
28. I. Puigdomenech, HYDRA MEDUSA: Make Equilibrium Diagrams Using Sophisticated Algorithms, Version 26 August 2009, Royal Institute of Technology, Stockholm and cited references therein.
29. Peculiarities of the passivation of pearlitic steels in solutions containing aluminum ions10.1023/A:1025811306212 ↗
30. Inhibition of corrosion of iron and aluminium10.1179/bcj.1996.31.3.233 ↗