How to Download BS PD 6484 PDF: A Guide on Corrosion at Bimetallic Contacts and Its Alleviation
If you are looking for a reliable source of information on corrosion at bimetallic contacts and its alleviation, you may want to download BS PD 6484 PDF. This document is a commentary published by the British Standards Institution (BSI) that provides guidance on how to avoid and mitigate corrosion problems caused by different metals and alloys in contact with each other.
Corrosion at bimetallic contacts is a common phenomenon that can affect the performance and durability of various structures and equipment. It occurs when two dissimilar metals or alloys are electrically connected and exposed to an electrolyte, such as water, soil, or air. The more noble metal (the one with higher corrosion resistance) becomes the cathode, while the less noble metal becomes the anode. The anode corrodes faster than it would if it were alone, while the cathode corrodes slower or not at all.
BS PD 6484 PDF explains the factors that influence corrosion at bimetallic contacts, such as the type of metals and alloys, the environmental conditions, the geometry of the contact, and the presence of protective coatings or insulators. It also gives advice on how to prevent or reduce corrosion by selecting compatible materials, applying suitable coatings or barriers, using cathodic protection or inhibitors, or modifying the design or operation of the system.
BS PD 6484 PDF is a useful reference for engineers, designers, contractors, inspectors, and owners who deal with bimetallic contacts in various applications, such as buildings, bridges, pipelines, power plants, ships, vehicles, and electrical equipment. It contains annotated tables that show the likely behavior of various couples in five different environments: fresh water, sea water, soil, urban atmosphere, and industrial atmosphere.
To download BS PD 6484 PDF, you can visit the official website of BSI (https://www.bsigroup.com) and search for the document using its title or number. You will need to register and pay a fee to access the full document. Alternatively, you can also find some online sources that offer free or discounted downloads of BS PD 6484 PDF. However, you should be careful about the quality and authenticity of these sources, as they may not be updated or authorized by BSI.
Downloading BS PD 6484 PDF can help you gain a better understanding of corrosion at bimetallic contacts and its alleviation. It can also help you improve your SEO ranking by using relevant keywords and providing valuable content to your readers. However, you should always cite your sources properly and respect the copyright of BSI when using BS PD 6484 PDF.
Examples of Corrosion at Bimetallic Contacts and Its Alleviation
To illustrate the concept and consequences of corrosion at bimetallic contacts and its alleviation, here are some examples of real-world cases where this phenomenon has occurred or been prevented.
Galvanic corrosion of steel bolts in aluminum structures: Steel bolts are often used to join aluminum components in various structures, such as aircraft, vehicles, and buildings. However, steel is less noble than aluminum, and when exposed to moisture or salt spray, it can corrode rapidly and weaken the joint. To prevent this, steel bolts can be coated with zinc or cadmium, which are more anodic than steel and will sacrifice themselves to protect the steel. Alternatively, nylon washers or sleeves can be used to insulate the steel bolts from the aluminum.
Corrosion of copper pipes in contact with iron pipes: Copper pipes are commonly used for plumbing and heating systems in buildings, as they have good thermal conductivity and resistance to corrosion. However, when copper pipes are connected to iron pipes, such as in water heaters or boilers, a galvanic cell can form and cause the iron pipes to corrode faster. To avoid this, dielectric unions or couplings can be used to separate the copper and iron pipes electrically. These devices have a non-conductive material, such as rubber or plastic, between the metal parts.
Corrosion of stainless steel in contact with carbon steel: Stainless steel is a type of steel that contains chromium, which forms a thin oxide layer on the surface that protects it from corrosion. However, when stainless steel is in contact with carbon steel, such as in welding or clamping, the oxide layer can be damaged or removed, exposing the stainless steel to corrosion. To prevent this, stainless steel can be passivated by immersing it in an acid solution that restores the oxide layer. Alternatively, stainless steel can be isolated from carbon steel by using spacers or gaskets made of non-metallic materials.
These are just some examples of corrosion at bimetallic contacts and its alleviation. By following the guidance provided by BS PD 6484 PDF, you can learn more about this topic and apply the appropriate measures to your own projects. aa16f39245