Question

What are the two conditions which promote corrosion?

Answer 1

Corrosion is a natural cycle that changes over a refined metal into a more chemically stable structure like oxide, hydroxide, carbonate, or sulfide. It is the progressive annihilation of materials (typically a metal) by chemical and additionally electrochemical reactions with their current environment. Corrosion designing is the field devoted to controlling and preventing corrosion. In the most well-known utilization of the word, this implies electrochemical oxidation of metal in reaction with an oxidant like oxygen or sulfates. Rusting, the development of iron oxides is a notable illustration of electrochemical corrosion.

Complete answer:
Corrosion is perhaps the most widely recognized phenomenon that we see in our day by day lives. We must have experienced that a few items made of iron are covered with some orange or reddish-brown colored hued layer at some point in time. The arrangement of this layer is the aftereffect of a synthetic interaction known as rusting, which is a type of corrosion.
If we take a look at the science behind corrosion, we can say that it's anything but an unconstrained/irreversible cycle wherein the metals transform into a much steady chemical compound like oxides, sulfides, hydroxides, and so on.
The following are the two conditions that advance corrosion:
The presence of oxygen prompts the arrangement of corrosion. At the point when the environment is oxygen-inadequate, corrosion happens.
The presence of pollutants like carbon dioxide and chloride additionally prompts the development of corrosion.

Note:
Iron is known to have great elasticity and inflexibility (particularly alloyed with a couple of different components). However, when exposed to rusting, iron items become fragile, flaky, and fundamentally weak. Corrosion can be named an electrochemical cycle since it for the most part includes redox reactions between the metal and certain atmospheric agents like water, oxygen, sulfur dioxide, and so on.