Corrosion of Copper with Nickel or Zinc Addition in a Typical Marine Atmospheric Environment
Source abstract
Abstract
Long-term corrosion behaviors of copper-zinc alloy (H62) and copper-nickel alloy (B30) in a typical marine atmospheric environment are systemically investigated in this work. Microstructural characterization and electrochemical tests show that pitting corrosion occurs on H62 alloy, and the bottom of the pits is dendritic due to preferential dezincification, whereas B30 exhibits uniform corrosion with a relatively compact corrosion product after long-term exposure. The outermost and innermost layers (accounting for 9.7% and 43.8% of the entire thickness of the corrosion products, respectively) with copper enrichment exist on B30, and the middle layer is enriched with nickel oxide. The annual weight loss rate for H62 is 1.5 times larger than for B30 (approximately 4.65 g m−2 y−1), indicating an improved corrosion resistance for the nickel addition compared to zinc. Furthermore, the Warburg impedance across the corrosion pits increases with the exposure period for H62 alloy due to the slower oxygen or soluble ion diffusion therein, which demonstrates that the pit growth becomes slow as the corrosion products thicken before re-passivation. Graphical Abstract
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Research context
OpenAlex topics: Corrosion Behavior and Inhibition · Hydrogen embrittlement and corrosion behaviors in metals · Aluminum Alloy Microstructure Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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