Q.1: Give the general design rules which should be taken to control corrosion of
ID: 2073338 • Letter: Q
Question
Q.1: Give the general design rules which should be taken to control corrosion of metals and alloys. Q.2: Give the general rules which should be taken to control or prevent the following types of corrosion: a. pitting, galvanic, crevice, Q.3: Shortly describe the different measures which should be taken to control the corrosiveness of aquatic environments. Q.4: Explain two effective methods used to control corrosion of metallic equipments in storehouse, discuss how they affect the corrosion process.Explanation / Answer
Q.1:Design features to reduce cossion may be summerizedas:
a.Ensure low stress concentration in the design.
b.Ensure minimum temperature gradient.
c.Minimize turbulence.
d.Avoid heterogeinity
e.Ensure there is adequate drainage in the system
Q.3.For prevention of corrossion in aquous environment,90/10 copper-nickel alloy is needed to be used.
Q.2. For controlling pitting corrision,
a.Maintain adequate pH level and chloride concentration.
b.Cathodic protection.
c.Use higher alloys(ASTM 48) for higher corrosion resistance.
For prevention of galvanic corrosion,
a.Avoid unfavourable area effect of a large anode and small cathode.
b.Select materials as close together as possible in the galvanic series.
For controlling crevice corrosion,
a.Keep junction points as wide open as possible
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