Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Corrosion of galvanized steel in alkaline solution associated with sulfate and chloride ions
Highlights Barrier protection from galvanized steel in sulfate-rich grout can be compromised. Sulfates in alkaline solution develop poor coverage of calcium hyroxyzincate. Corrosion development of galvanized steel captured by EN technique.
Abstract Corrosion mitigation strategies for structural steel bridge elements including post tensioned steel components include the use of galvanized steel. The zinc alloy layers and subsequent precipitation of a dense surface oxide in alkaline environments provide beneficial barrier protection to mitigate corrosion. However, severe corrosion of galvanized steel components in contact with sulfate-rich deficient cementitious grout was documented to occur in less than 8 years of bridge service. Electrochemical testing and material characterization showed that the presence of sulfates in alkaline solutions allow for prolonged zinc activity and hindered passivation by the incomplete surface coverage and the precipitation of large sized calcium hydroxy zincate. OCP, LPR, and electrochemical noise (EN) testing showed greater corrosion activity of galvanized steel in chloride and sulfate solutions. EN identified local corrosion activity of the zinc associated to the porous nature of the surface oxide layer.
Corrosion of galvanized steel in alkaline solution associated with sulfate and chloride ions
Highlights Barrier protection from galvanized steel in sulfate-rich grout can be compromised. Sulfates in alkaline solution develop poor coverage of calcium hyroxyzincate. Corrosion development of galvanized steel captured by EN technique.
Abstract Corrosion mitigation strategies for structural steel bridge elements including post tensioned steel components include the use of galvanized steel. The zinc alloy layers and subsequent precipitation of a dense surface oxide in alkaline environments provide beneficial barrier protection to mitigate corrosion. However, severe corrosion of galvanized steel components in contact with sulfate-rich deficient cementitious grout was documented to occur in less than 8 years of bridge service. Electrochemical testing and material characterization showed that the presence of sulfates in alkaline solutions allow for prolonged zinc activity and hindered passivation by the incomplete surface coverage and the precipitation of large sized calcium hydroxy zincate. OCP, LPR, and electrochemical noise (EN) testing showed greater corrosion activity of galvanized steel in chloride and sulfate solutions. EN identified local corrosion activity of the zinc associated to the porous nature of the surface oxide layer.
Corrosion of galvanized steel in alkaline solution associated with sulfate and chloride ions
Permeh, Samanbar (Autor:in) / Lau, Kingsley (Autor:in)
18.05.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Galvanized , Steel , Coatings , Corrosion , Sulfate , Chloride , Electrochemical noise
| British Library Online Contents | 2018
Initiation of localized steel corrosion in alkaline sulfate solution
| Springer Verlag | 2021
Initiation of localized steel corrosion in alkaline sulfate solution
| Online Contents | 2021
Corrosion Behavior of Galvanized Steel in Rust-Layer Simulating Solution Containing Chloride Ion
| British Library Online Contents | 2013
Corrosion film breakdown of galvanized steel in sulphate-chloride solutions
| British Library Online Contents | 2014