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This study presents an overview of a number of factors influencing the pitting corrosion of Ti in aggressive environments. Effects of temperature and metal cations on pitting corrosion of Ti.
This study presents an overview of a number of factors influencing the pitting corrosion of Ti in aggressive environments. Firstly, the effects of temperature and metal cations on the pitting corrosion of Ti are summarized based on previous research. The pitting corrosion of Ti in chloride solutions is strongly temperature-dependent; the breakdown potential Eb decreases as the operating temperature increases. The presence of oxidizing metal cations can cause severe pitting on Ti in chloride solutions. Secondly, the inhibition effects of different oxygen-containing anions, such as CrO42−, HPO42−, SO42−, SeO42− and S2O32−, on the pitting corrosion of Ti in Cl− solutions at 150°C are explored. SO42−, SeO42−, CrO42− and HPO42− anions all retards the pitting corrosion of Ti in Cl− solutions. The inhibition effect decreases in the order: CrO42−> SO42− = SeO42− > HPO42−. On the other hand, S2O32− and Cl− ions have a synergistic effect in inducing localized corrosion on Ti.
Key words: pitting corrosion, aggressive, temperature, metal cation, oxygen-containing anion
Several experiences with the use of titanium heat exchangers in refining processes are summarized. These involve distillation column overhead condensers in atmospheric crude distilling units, fluid catalytic cracking units, delayed coking units, and sour water strippers. The causes of problems are discussed. Needs for additional data are highlighted.
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Alloys of Titanium were compared. Results of crevice corrosion, U-bend, and general corrosion tests in various different media are discussed in this paper. These tests were conducted in order to better understand how Grade 38 compares to common titanium alloys.