Which corrodes is faster?, Chemistry

Which of the following is corrodes faster?Iron pole in sea water or iton pole on the beach?

Ans) There are various ways of reducing and preventing this form of corrosion.

One way is to electrically insulate the two metals from each other. Until they are in electrical contact, there can be no galvanic couple set up. This can be completed using plastic or another insulator to separate steel water pipes from copper-based fittings or by using a coat of grease to divide aluminium and steel parts. Use of absorbent washers that may retain fluid is often counter-productive. Piping can be isolated with a spool of pipe made of plastic materials or made of metal material internally coated or lined. It is important that the spool has a minimum length of approx 500 mm to be effective.

One more way is to keep the metals dry or shielded from ionic compounds (salts, acids, bases), for example by painting or encasing the protected metal in plastic or epoxy, and permitted them to dry. Coating the two materials or if it is not possible to coat both, the coating shall be applied to the more noble, the material with higher potential. This is essential because if the coating is applied only on the more active material, in case of damage of the coating there will be a large cathode area and a very small anode area, and for the area effect the corrosion rate will be very high.

It is also possible to choose metals that have similar potentials. The more closely matched the individual potentials, the lesser the potential difference and therefore the lesser the galvanic current. Using the same metal for all construction is the most precise way of matching potentials. Electroplating or other plating can also help. This tends to use more noble metals that resist corrosion better. Chrome, nickel, silver and gold can all be used. Galvanizing with zinc protects the steel base metal by sacrificial action.

Posted Date: 3/11/2013 2:19:33 AM | Location : United States







Related Discussions:- Which corrodes is faster?, Assignment Help, Ask Question on Which corrodes is faster?, Get Answer, Expert's Help, Which corrodes is faster? Discussions

Write discussion on Which corrodes is faster?
Your posts are moderated
Related Questions
The mineral pyrite, or iron pyrite, is an iron sulfide with the formula FeS 2 . This mineral''s metallic luster and pale brass-yellow hue have earned it the nickname fool''s gold b

wht is the strucutre of benzene?

Q. In 1982, the International Union of Pure and Applied Chemistry recommended that the value of the standard pressure p o  be changed from 1 atm to 1 bar. This change affects the


Conjugate-base anion of diethyl malonate The conjugate-base anion of diethyl malonate would be formed with sodium ethoxide, but it would not react with bromobenzene due to the

Explain the Liquid Water aspect of using phase rule? For a single phase of pure water, P equals 1. If we treat the water as the single species H 2 O, s is 1 and r is 0. The pha

Q. What are Trioxides? The selenium and tellurium trioxides are not stable, SO 2 , is the only important trioxide in the group. Its preparation has been described above. Sul

Word root - IUPAC System of Naming Organic Compounds The word root represents the number of carbon atoms that are present in the chain. Table : Chain le

Physical Properties of Maleic Acid and Fumaric Acid (i) Maleic Acid and Fumaric Acid Both are colourless crystalline solids. They both are soluble in water. (ii) The melting

Formic acid is a weak acid along with a pKa of 3.75. The name comes by the Latin term "formica" ("ant") since this is very plentiful into the secretions of several species of ants,