Hydrogen Permeation Through Cathodically Protected Iron Membranes in Simulated Concrete Environment

Abstract

Hydrogen permeation through cathodically protected iron membranes in simulated cement pore solution (SPS) with 3.5% NaCl addition was measured using the electrochemical permeation technique. Hydrogen permeation through mortarcovered membranes was also measured in 3.5% NaCl solution using the same technique. The effects of applied cathodic current density, hydrogen charging time, and mortar cover thickness on the hydrogen permeation rate were investigated. Scanning electron microscopy and energy dispersive x-ray spectroscopy analysis were used to examine the membrane surface for solid deposit formation. The results showed that increasing the applied cathodic current density resulted in an increase in the hydrogen permeation current. The permeation current showed a descending trend with time as a result of the formation of calcium-rich deposits on the cathodic surface of the membrane. Surface coverage by the calcium deposits increased markedly after three weeks of hydrogen charging.

Progress in the development of sour corrosion inhibitors: Past, present, and future perspectives

“…Sour corrosion is a longstanding problem in the oil and gas industry and was first reported in the 1940s in the Louisiana and Texas oil wells [5,6]. Sour corrosion is defined as the corrosion of metals in aqueous environment containing acid gases (H 2 S/CO 2 ), but with H 2 S concentration sufficiently higher than that of CO 2 to dominate the corrosion behaviour and corrosion products [5]. According to NACE, the partial pressure of hydrogen sulphide should be higher than 0.30 kPa (0.05 psi) [7].…”

Διερεύνηση Της Χρήσης Ειδικών Πρόσθετων Για Την Προστασία Του Οπλισμού Στο Σκυρόδεμα

“…Θα πνέπεζ κα ημκζζηεί υηζ ημ ζφζηδια ηαεμδζηήξ πνμζηαζίαξ (άκμδμζ, δθεηηνυδζα ακαθμνάξ) ημπμεεηείηαζ ιυκζια ζηδκ ηαηαζηεοή. υπμο ημ δοκαιζηυ ημο πάνεζ ηζιέξ ανκδηζηυηενεξ ημο -950mV ςξ πνμξ δθεηηνυδζμ ακαθμνάξ SCE[117,118,119].Δπίζδξ έκα ελίζμο ζδιακηζηυ πνυαθδια δδιζμονβείηαζ εάκ ημ ζφκμθμ ημο μπθζζιμφ ηδξ ηαηαζηεοήξ δεκ ανίζηεηαζ ζε δθεηηνζηή ζοκέπεζα. Ζ δθεηηνζηή αζοκέπεζα ημο μπθζζιμφ έπεζ ςξ ζοκέπεζα ηδκ ιενζηή πνμζηαζία ηδξ ηαηαζηεοήξ ιε απμηέθεζια ημκ ζπδιαηζηυ βαθαακζηχκ ζημζπείςκ ιεηαλφ ηςκ οπυ πνμζηαζία πενζμπχκ ηαζ ιδ[120,121].…”