Comparative corrosion behavior of Alloys 690 and 800 in high-temperature water: Combined effects of polyacrylic acid and dissolved oxygen
Source abstract
Abstract
The corrosion behavior of Alloys 690 and 800 was investigated in high-temperature water containing dissolved oxygen (DO) and polyacrylic acid (PAA). DO caused Cr dissolution as HCrO 4 –, leading to the formation of Cr-depleted oxide films on both alloys. Alloy 800, with higher Fe content, formed a more protective Ni-Fe spinel inner layer, while Alloy 690, with lower Fe content, formed a less protective NiO inner layer. The thermal degradation of PAA resulted in surface acidification, which accelerated Cr and Ni dissolution under DO, further intensifying corrosion. Under DO conditions, Alloy 800 exhibited superior oxidation resistance compared to Alloy 690, regardless of PAA presence.
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Research context
OpenAlex topics: Corrosion Behavior and Inhibition · High-Temperature Coating Behaviors · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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