The document can be downloaded from the BSI website or from other online sources . It is also cited by other standards and publications that deal with foundations and corrosion. The document is intended to provide general information and does not replace the need for specific design calculations and testing for each application.
Bimetallic corrosion, also known as galvanic corrosion, is a type of electrochemical corrosion that occurs when two dissimilar metals are in electrical contact with each other in the presence of an electrolyte. The more active metal (the anode) corrodes faster than it would alone, while the less active metal (the cathode) corrodes slower than it would alone. The corrosion rate depends on several factors, such as the difference in electrochemical potential between the metals, the area ratio of the anode to the cathode, the conductivity of the electrolyte, and the environmental conditions. Bimetallic corrosion can cause serious damage to structures and equipment, such as pipelines, bridges, ships, vehicles, and electrical devices.
To prevent or minimize bimetallic corrosion, some possible measures are:
Using metals that have similar electrochemical potentials or are compatible with each other in the given environment.
Applying protective coatings or paints to the metals to isolate them from the electrolyte.
Inserting insulating materials or devices between the metals to break the electrical contact.
Applying cathodic protection to the anode to make it more noble than the cathode.
Controlling the environmental factors that affect the corrosion rate, such as moisture, oxygen, pH, temperature, and pollutants.
Bs Pd 6484.pdfl provides useful information and guidance on bimetallic corrosion and its alleviation. It is a valuable resource for engineers and designers who work with different metals and alloys in various applications.
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