The distribution of current densities at the cathode surfaces of cathodic protection systems

1970 ◽  
Vol 17 (2) ◽  
pp. 23-26 ◽  
Author(s):  
C.L. Wilson
Keyword(s):  
Cathodic Protection ◽  
Protection Systems ◽  
Current Densities

Solving Design Problems for Cathodic Protection of Glass-Lined Domestic Water Heaters

CORROSION ◽  
1960 ◽  
Vol 16 (9) ◽  
pp. 9-17
Author(s):  
H. C. Fischer
Keyword(s):  
Cathodic Protection ◽  
Hot Water ◽  
Test Results ◽  
Domestic Water ◽  
Design Data ◽  
Design Problems ◽  
Water Heaters ◽  
Protection Systems ◽  
Current Densities ◽  
Cathodic Protection System

Abstract Factors important in designing” a cathodic protection system for glass lined domestic hot water heaters are considered. Method by which bare areas of single coated glass lined tanks can be calculated is explained, and comparisons are made between calculated values and those obtained by tests on tanks under protection. Instruments for making these tests and techniques are illustrated and described. Design data relevant to required current densities are considered with respect to platinum clad tantalum and platinum plated titanium anodes. Regulations of Underwriters’ Laboratories concerning accumulated gas from cathodic protection systems are weighed against test results and the volume of gas actually produced is measured and analyzed. Design criteria and details for rectified current used in systems applied to electrically heated tanks are given. Details of a thermoelectric generator for use with gas fired tanks are given. This generator produces sufficient current to protect a well-lined tank in the highest resistivity water likely to be encountered. 5.2.3

Corrosion Behaviour of Unprotected Weldments in Marine Environments

CORROSION ◽  
10.5006/3824 ◽  
2021 ◽  
Author(s):  
Nicholas Senior ◽  
Lawrence Parkinson ◽  
Magdalene Matchim ◽  
Jennifer Collier ◽  
Hung-Wei Liu
Keyword(s):  
Weld Metal ◽  
Cathodic Protection ◽  
Corrosion Behaviour ◽  
Coast Guard ◽  
Metal Corrosion ◽  
Corrosion Performance ◽  
Accelerated Corrosion ◽  
Potential Safety ◽  
Protection Systems ◽  
Welding Consumables

In the absence of protective measures such as paint or cathodic protection systems, steel weldments, immersed in seawater, are expected to corrode freely. This is particularly true for the ice breakers serving the Canadian Coast Guard, where, in the course of operations, paint is scoured from the vessel hulls and cathodic protection systems were not installed. However, the weldments do not corrode uniformly. In some cases, the weld itself corrodes rapidly and requires regular replacement. At the other extreme, the heat-affected zones corrode instead—a potential safety and integrity concern. The morphology of ice breaker weldment corrosion has altered over the last few decades and this has been attributed to changes in welding consumables and processes. The current study is an investigation into the corrosion characteristics of weldments with a particular focus on the compositional differences between weld metal and hull plate steels. A method has been developed for numerically describing the corrosion of weldment regions (plate steel, heat-affected zones, weld cap passes and weld re-heated zones) arising from an accelerated corrosion test. This in turn enabled the development of an equation that predicts weldment corrosion performance based entirely on material composition. This permits selection of welding consumables that are anticipated to give good corrosion performance, avoiding the extremes of rapid weld metal corrosion and preferential heat-affected zone attack.

Operation and maintenance of Impressed Current Cathodic Protection systems on concrete civil structures

2018 ◽  
Author(s):  
Jacob Brink Jansson ◽  
Ruth Sørensen ◽  
Kirsten Riis
Keyword(s):  
Service Life ◽  
Cathodic Protection ◽  
Protection System ◽  
Civil Structures ◽  
Correct Operation ◽  
Operation And Maintenance ◽  
Number Of Factors ◽  
Protection Systems ◽  
Cathodic Protection System

Cathodic protection is a very well-known method of preventing or stopping reinforcement corrosion and thereby extending the service life of reinforced concrete civil structures. However, a number of factors, which among others are design, materials and components, installation methods, quality of workmanship, and operation and maintenance of the cathodic protection system, have influence on the functionality and effectivity of the cathodic protection system. The optimum design that fulfils the Client''s requirements to cost, traffic disruption, service life, etc. shall be determined in accordance with the structure layout and the ability of the Client''s organisation to conduct operation and maintenance. It is critical to ensure that all components are installed properly to achieve the expected service life of the system. Regular and correct operation and maintenance is also crucial to ensure the functionality and effectivity system.

AUTOMATIC CONTROL OF POWERSTATION: Cathodic Protection Systems

1963 ◽  
Vol 10 (4) ◽  
pp. 92-93
Author(s):  
W. Matthewman ◽  
J. Malster ◽  
A.D. Wallis
Keyword(s):  
Automatic Control ◽  
Cathodic Protection ◽  
Protection Systems
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