Metallurgical Treatment fo Corrosion?

Question

People any suggestion for my final paper,,
what treatment should i do to a metal that affect its corrosion properties,,

any kinds of treatnebt;heat treatment, mechanical treatmen etc

Answer 1

# Metallurgical Treatment fo Corrosion is a big subject.

It depends upon the type of environment[internal and external]
in which a material operates and type of material.

#for example:
To prevent the external of a chemical plant equipment like column or vessel , you can use the anti-corrosive paint , resin or temperature resistant paint as the case may be.
-Insulation should be weather sealed.
#Classification of corrosion prevention methodes :
1.Design improvement.

2.Change of metals :
-change of composition
-change of micro-structure
-elimination of tensile stresses.
-introduction of surface compressive stresses.

3.change of environment :
-removal of corrosive constituents,like oxygen removal and moisture removal.
-use of inhibitors
a.chemical passivators.
b.adsorption inhibitors
c.film forming inhibitors
d.vapour phase inhibitors
-Change of operating variables:
a.temperature
b.velocity
c.pH.

4.CHANGE OF METAL ELECTRODES:
-Cathodic protection
a.sacrificial anodes
b.impressed current.
-anodic protection.

5.Use of coating for seperating metal from the environment:
-metallic coating
a.cathodic
b. anodic
-Non metallic coating
a.vitreous
b.cement
c.chemical conversion
d.paints.

Above all terms are itself is a big subject and can be found in detail on the search engine like yahoo and google.

#If you can, get a following book:
"An introduction to metallic corrosion and its prevention"
Author: Raj Narayan
oxford and IBH PUBLISHING co. pvt. ltd.

Please visit:[click on the hyperlink:

http://www.actonrust.com/coatings.htm

There are lot of heat treatments,for example:
"Annealing is a technique used to recover cold work and relax stresses within a metal. Annealing typically results in a soft, ductile metal. When an annealed part is allowed to cool in the furnace, it is called a "full anneal" heat treatment. When an annealed part is removed from the furnace and allowed to cool in air, it is called a "normalizing" heat treatment. During annealing, small grains recrystallize to form larger grains. In precipitation hardening alloys, precipitates dissolve into the matrix, "solutionizing" the alloy."

Click on:
http://www.answers.com/topic/heat-treatment?cat=health
http://www.efunda.com/processes/heat_treat/introduction/heat_treatments.cfm
http://en.wikipedia.org/wiki/Heat_treatment

Answer 2

You need to be much more specific... What metal are you talking about? What is the environment? What is the application for the piece of metal? Different alloys are susceptable to corrosion in different environments. Often time, it is the corrosion characteristics that dictate what alloy is selected. You are correct that the heat treatment can be an important part of the answer. One example is stainless steels (and there are 4 different types of stainless and many different alloys within each type) where welding damages the corrosion resistance (sensitization) but the piece can be heat treated after welding to restore the corrosion performance. There are also many different types of corrosion and the schemes for mitigating them are different. Figure out what your specific application is and do some research on the alloy and the environment. Wikipedia is a good place to start, search for corrosion. good luck