Shipwrecks, Corrosion and Conservation

6: Optional - Shipwreck, Corrosion and Protection 1: Marine chemical composition means its potential role as an electrolyte to determine the origin of oceanic minerals: The hydrothermal vents of oceanic food in the global environment Identification - identification in seawater and name There are two main causes of salt, rainwater and groundwater leaching. Water dissolves salt through hot water holes.

I can not believe it, but I have 15 types of corrosion. In the previous blog, I explained only three kinds of corrosion (uniform corrosion, electrolytic corrosion, concentrated cell corrosion), but this blog will explain in detail about three kinds of pit corrosion, crevice corrosion and filiform corrosion. Pitting corrosion forms bubbles randomly called pits. A pit is the shape of a wide shallow bubble, or narrow and notched bubbles deeply beneath the surface of a material. Other types of pitting corrosion are posted on the American Corrosion Technology Association website.

Corrosion is generally considered to be a slow material degradation process (general corrosion, pitting, peeling, etc.) occurring over a relatively long period of time. Other forms of corrosion degradation can occur very rapidly in days or hours, resulting in catastrophic consequences. These forms (such as stress corrosion cracking, environmental embrittlement and corrosion fatigue) depend on the chemical and mechanical aspects of the environment and can cause devastating structural failure without warning.

Let's begin with basic corrosion form. Uniform corrosion can be thought of as rust. That is because it is the most common form of corrosion. Because rust is common, it is not a big deal for an architect to deal with this problem. Uniform corrosion can be controlled with a protective coating such as a coating or a sealant. Electric corrosion occurs when different metals are in contact with each other. This form of corrosion is easily found where two metals meet. Common accessories such as insulation washers and washers help prevent electrolytic corrosion but should be replaced with periodic maintenance.

If steel is in contact with other metals in the corrosive electrolyte, electrolytic corrosion or dissimilar metal corrosion may occur. The best way to avoid this is to make sure that the different metals are not in direct contact. Of course, this is not always possible. Another technique is to coat the metal with a material that prevents electrical conduction between the metals, such as electroplating or anodization.