Investigation of thiosulfate adsorption on 316 stainless steel in neutral solutions by radioactive labeling, electrochemistry, and Auger electron spectroscopy

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.2044074· OSTI ID:61503

Thomas, A E; Sung, Y E; Gamboa-Aldeco, M; Franaszczuk, K; Wieckowski, A ^[1]

---

1. Univ. of Illinois, Urbana, IL (United States). Dept. of Chemistry

The authors report on thiosulfate adsorption on a 316 stainless steel electrode in neutral solutions by radiochemical, electrochemical, and Auger electron spectroscopy (AES) measurements. In contrast to previous work on thin metal films or metal electrodeposits to model real-life metal (alloy) samples, their radiochemical approach permits coverage measurements of labeled adsorbates on smooth solid electrodes of convenient size and thickness. A dedicated electrode preparation yields a reproducible surface for fast and reversible thiosulfate adsorption from a perchlorate solution. However, on the same time scale, reversible adsorption is impeded in sulfate media. Further, no thiosulfate adsorption occurs in borate buffer solution, and complex thiosulfate adsorption behavior predominates in solutions containing varying amounts of chloride anions, initially increasing with bulk chloride concentration, maximal at 10{sup {minus}4} to 10{sup {minus}5}M Cl{sup {minus}}, and decreasing at higher chloride concentration. The authors conclude that small amounts of surface chloride assist the thiosulfate adsorption, but increasing surface Cl{sup {minus}} coverage becomes competitive to that of thiosulfate. The chloride adsorption enhancing mechanism probably results from a destabilization of the locally ordered thiosulfate surface structure. Radiochemistry and AES show that long exposure to thiosulfate solutions results in permanent thiosulfate immobilization on the stainless fate adsorption, but increasing surface Cl{sup {minus}} coverage becomes competitive to that of thiosulfate. The chloride adsorption enhancing mechanism probably results from a destabilization of the locally ordered thiosulfate surface structure. Radiochemistry and AES show that long exposure to thiosulfate solutions results in permanent thiosulfate immobilization on the stainless steel surface.

• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76ER01198; FG02-91ER45439
• OSTI ID: 61503
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 2 Vol. 142; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADSORPTION
COMPARATIVE EVALUATIONS
CORROSION INHIBITORS
CORROSION PROTECTION
ELECTROCHEMICAL CORROSION
ELECTROLYTES
EXPERIMENTAL DATA
MEASURING METHODS
STAINLESS STEEL-316
THIOSULFATES