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Impressed current cathodic protection (ICCP) for reinforced concrete structures has been installed on numerous bridges and wharves in Australia over the past 40 years. The exposure conditions at the majority of these bridges and wharves made them more susceptible to chloride-induced corrosion.
The ICCP systems in Australia are designed, installed and monitored in accordance with the global cathodic protection standards such as AMPP Standard SP 0290-2019, International Standard ISO 12696:2022, and Australian Standard AS 2832.5 – 2008 (R2018).
Electrochemical corrosion protection systems have been used in Australia for many years for the corrosion protection of concrete infrastructure assets in marine environments.Impressed current cathodic protection (ICCP) can be highly effective for the corrosion protection of reinforced concrete structures, however, some of the potential shortcomings of these systems are their performance in high resistivity concrete, anode installation defects in tidal zones, premature failure of some system components and the requirements for ongoing monitoring.
For galvanic-based anode systems, most of the recent innovations have been associated with backfill materials and the development of systems that incorporate a temporary impressed current phase followed by permanent galvanic protection. While the long-term performance of some of the newly developed systems is still subject to ongoing assessment, the overall performance data from galvanic-based systems indicates that one of the potential shortcomings is the inability of these systems to deliver sufficient corrosion protection over time, especially in highly corrosive environments.
This paper presents guidelines related to the selection process of the corrosion protection system for concrete structures. These guidelines have been developed based on the author’s experience with the design, installation, and monitoring of various corrosion protection systems installed in Australia for the protection of marine infrastructure assets.
A new building was under construction for a hospital campus for specialized treatment. For logistical reasons, a multi-million dollar piece of medical equipment was placed in one room prior to completion of construction. A pedestal is installed on the floor and houses copper gas tubing and electrical connections for the equipment.
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Cathodic protection (CP) is used to prevent external corrosion on underground pipelines. The effectiveness of CP is commonly evaluated by measuring the DC potential (voltage) of the pipeline with respect to a reference electrode located on the surface of the earth above the pipeline. Criteria used to interpret pipeline potential measurements are given by Section 6 of NACE SP-0169-2013 “Control of External Corrosion on Underground or Submerged Metallic Piping Systems.
The need for corrosion mitigation and repair is a perennial concern for a wide array of industries. An attractive evolution in coatings application for mitigating the effects of environmental/operational degradation is cold spray of metallic replacement layers. As cold spray technologies continue to become more commonplace, portable, low-pressure cold spray systems presents an opportunity to bring metallic repair to the field for heavily damaged or corroded assets.