SEDL / STP / STP965-EB / STP25864S

A New Method to Monitor In-Situ Protective Properties of Rust on Weathering Steel

Ito, S
Senior research chemist, research chemist and general manager, R&D Laboratories-I, Nippon Steel Corporation, Kawasaki,

Kihira, H
Senior research chemist, research chemist and general manager, R&D Laboratories-I, Nippon Steel Corporation, Kawasaki,

Murata, T
Senior research chemist, research chemist and general manager, R&D Laboratories-I, Nippon Steel Corporation, Kawasaki,

Pages: 8    Published: Jan 1987

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Abstract

To evaluate how protective rust is, and to understand the role rust plays, electrochemical impedance of the rust films on low alloy steels, particularly weathering steels, was studied in a sodium sulfate (Na²SO⁴) solution. By the analysis of the harmonic current, the impedance in the frequency range of 1 Hz to 1.0 kHz is considered to be due to the ion transfer resistance through the rust film, which is dominant factor for the protective properties of the rust films. Based on this principle, a compact instrument was developed to monitor the protective properties of the rust films formed on weathering steels of field structures.