How saltwater is enemy of metals

 Saltwater or called saline water is a kind of water that contains dissolved salts in a high concentration. It contains ions which work as a good conductor of electricity. 

The salinity of seawater is roughly around 35,000 ppm, which is equivalent to 35 grams of salt per one litter. 

This saltwater has become an enemy of metals, as the combination of moisture, oxygen, and salt, especially sodium chloride, damages metal, and this combination either corrode the metal or eats away further making the metal weak. 

Saline water makes metal weak five times faster than freshwater does. Even though Bacteria present in oceanic water consume metal like iron and their excretions turn into rust.

According to our online science tutoring methods there are two types of corrosion that saltwater does like electrochemical corrosion, and anaerobic corrosion

1. Electrochemical Corrosion

Here saltwater directly attacks metal and corrodes the metal, as the metal ions get dissolved in water and further, saltwater conducts electricity as it contains ions, which attract ions or electrons from other compounds and corrosion occurs. 

2. Anaerobic Corrosion

It occurs when metal is exposed to saltwater for an extended period, further leaving deposits that contain sulphates on the surface of the metal as it sits in saltwater. 

The deposits that contain sulphates are Hydrogen sulphide which corrodes metal slowly and slowly, and at the same time, bacteria growing in saltwater use this hydrogen to corrode the metal as well.

Ways to prevent corrosion from saltwater:

1. After removal of metal from saltwater rinse the metal completely in freshwater thoroughly, especially in crevices and pockets where saltwater dawdles. 

To increase the shelf- life of metal that regularly sits in saltwater, keep the metal submerged completely in oil, antifreeze, or kerosene. 

2. The process of corrosion speeds up when the metal is introduced in saltwater to the formula. Because of the increased presence of dissolved ions.

 Due to the presence of dissolved ions, these ions allow electrons to move faster on the metal, further speeding up the formation of rust over the metal surface first, and making the metal weak and brittle.

Common Corrosion Points in Home

Some corrosion points in the home are foundation and plumbing. In home’s concrete foundation is supported by steel rods, these steel rods can be corroded if there is the provision of saltwater, as rust takes up over the metal, it takes more volume than steel, and when the steel rods start to corrode, the concrete is in danger of weakening and crumbling.

In the case of plumbing, corrosion appears when the pH level of water is too high or too low, it means either the water is too acidic or too basic, or corrosion happens when a high level of salt is dissolved in water, sand, or other sediments are introduced into the water or when there is improper installation. 

Even with the salts present in the air, if your home is near seawater, the presence of salts will make it more challenging to keep your home’s pipes away from rusting. This rust can contaminate your water and gives an unpleasant taste and smell.

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