In saltwater environments, galvanic corrosion can occur when two metals, with different charges, are connected through a conductive path. Additionally, such types of corrosion may also be facilitated when one of the two metals is considered to be impure.
The movement of molecular components from the anodized material to the cathodic material causes this type of deterioration. Preventing galvanic corrosion can be done by applying a preventive coating over the exposed surface. This robust layer stabilizes chemical reactions on the material, disrupting the transfer of ions related to corrosion.
Read on to learn about the different types of corrosion in marine environments.
Stress-related corrosion involves a material that has experienced intense tensile stress. This causes the surface to become weaker, forming cracks and rips. Unlike galvanic corrosion, this type of degradation on the surface can be caused by welding and extreme temperatures. Furthermore, the presence of saltwater could stimulate stress-related corrosion and streamline damage. If left untreated, the opening could allow foreign contaminants to enter the unit and wreak havoc on internal parts.
Localized and Caustic
When corrosion occurs on one part of a device, other sections that are well-protected are rarely affected. This form of isolated damage is called localized corrosion. Such occurrences will cause the affected area to deteriorate at a very rapid rate, while the other components remain sturdy. As a result, the unit becomes less sturdy and efficient. If the affected section of the unit is a critical component, such as wiring, the onset of corrosion may result in premature failure.
The presence of moisture and water in marine locations may cause stable chemicals to become highly corrosive. This type of corrosion is facilitated by caustic agents that mix with watery elements in the surrounding area. The harmful combination causes a corrosive substance to propagate; and when exposed to unprotected surfaces, may result in corrosion. An example of a substance that can initiate caustic corrosion is hydrogen sulfide.