Electrochemical Characterisation of the Corrosion Properties of Aluminium Brazing Sheet

Meijers, S.D.; Wittebrood, A.; Wit, J.H.W. de; Bürger, A.

doi:10.4028/www.scientific.net/msf.396-402.1425

Cited by 3 publications

(1 citation statement)

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“…Cyclic corrosion testing is one of the common ways to measure the corrosion resistance of heat exchanger materials, both for the tube and fin alloys . Therefore, we tested Cu substrates coated with HTMS, SHP Cu substrates, AP MO-CVD and sol–gel SiO 2 and sol–gel SiO 2 and Parylene C-coated Cu substrates for 4 consecutive days (identical to the flow corrosion experiment duration).…”

Section: Resultsmentioning

confidence: 99%

Scalable Corrosion-Resistant Coatings for Thermal Applications

Khodakarami

Zhao

Rabbi

et al. 2021

ACS Appl. Mater. Interfaces

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Corrosion of metallic substrates is a problem for a variety of applications. Corrosion can be mitigated with the use of an electrically insulating coating protecting the substrate. Thick millimetric coatings, such as paints, are generally more corrosion-resistant when compared to nanoscale coatings. However, for thermal systems, thick coatings are undesirable due to the resulting decrease in the overall heat transfer stemming from the added coating thermal resistance. Hence, the development of ultrathin (<10 μm) coatings is of great interest. Ultrathin inorganic silicon dioxide (SiO2) coatings applied by sol–gel chemistries or chemical vapor deposition, as well as organic coatings such as Parylene C, have great anticorrosion performance due to their high dielectric breakdown and low moisture permeability. However, their application to arbitrarily shaped metals is difficult or expensive. Here, we develop a sol–gel solution capable of facile and controllable dip coating on arbitrary metals, resulting in a very smooth (<5 nm roughness), thin (∼3 μm), and conformal coating of dense SiO2. To benchmark our material, we compared the corrosion performance with in-house synthesized superhydrophobic aluminum and copper samples, Parylene C-coated substrates, and smooth hydrophobic surfaces functionalized with a hydrophobic self-assembled monolayer. For comparison with state-of-the-art commercial coatings, copper substrates were coated with an organo-ceramic SiO2 layer created by an elevated temperature and atmospheric pressure metal organic chemical vapor deposition process. To characterize corrosion performance, we electrochemically investigated the corrosion resistance of all samples through potentiodynamic polarization studies and electrochemical impedance spectroscopy. To benchmark the coating durability and to demonstrate scalability, we tested internally coated copper tubes in a custom-built corrosion flow loop to simulate realistic working conditions with shear and particulate saltwater flow. The sol–gel and Parylene C coatings demonstrated a 95% decrease in corrosion rate during electrochemical tests. Copper tube weight loss was reduced by 75% for the sol–gel SiO2-coated tubes when seawater was used as the corrosive fluid in the test loop. This work not only demonstrates scalable coating methodologies for applying ultrathin anticorrosion coatings but also develops mechanistic understanding of corrosion mechanisms on a variety of functional surfaces and substrates.

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Section: Resultsmentioning

confidence: 99%