BENZ Packaging Solutions Private Limited 

What is Corrosion?

Corrosion is a natural process that reforms a fine metal into synthesized homogenous form such as oxide, sulfide or hydroxide. This also means slow and gradual destruction of materials (generally metals) through chemical or electromagnetic reaction under present climatic conditions and hence Rusting.

Corrosion can be centered locally and forms a pit or crack. It can also expand and spread across a wide area, not necessarily uniform. This is because corrosion is a dissemination controlled process and it occurs on exposed surfaces only.

Factors affecting Corrosion – Why does Corrosion Happen?

There are many reasons why a corrosion can happen. In fact the nature of corrosion or the colour of the rust sometimes tell a lot about the reasons. Nevertheless, we have complied few reasons as to why it can happen.

(a) Nature of metals – Some metals corrode faster than others. Corrosion is an oxidation-reduction reaction, and those metals with the lowest standard reduction potential are most likely to be oxidized.

(b) Presence of moisture – Corrosion rate will escalate in the presence of water and atmospheric gases like CO2, SO2, etc. Any rise / fall in temperature (by 10%) and humidity (by 20%) will also increase the rate of corrosion.

(c) Salt / Impurities – The impurities present in the cleaning chemicals or Rust Preventive Oil will help in setting up voltaic cells, which accelerate the pace of corrosion. Also, corrosion occurs faster in a coastal and marine environment because salt present in the environment increases the electrolytes in the moisture.

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