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Advanced Corrosion Engineering
What is meant by MPY in corrosion?
a) Mils penetration per year
b) Meter penetration per year
c) Milli meter penetration per year
d) Micro meter penetration per year
Which of the following expression is used to calculate MPY?
MDD in corrosion is abbreviated as ______
a) milligrams/sq. decimeter/decade
b) millimeters/sq. decimeter/day
c) milligrams/sq. decimeter/day
MPY is used to measure weight loss per unit area.
_____ is/are used to measure the extent of pitting corrosion.
c) Both MPY and MDD
Which of the following law is used to derive the corrosion rate expression?
a) Newton’s law
b) Henry’s law
c) Raoult’s law
d) Faraday’s law
Which following expression is used to find the corrosion rate from current density of a corroding specimen?
a) W/At = [(I × am) / (n × F)]
b) W/At = [(I × am) / (n × d × F)]
c) W/At = [534 × (I × am) / (n × F)]
d) W/At = [(I × am) / (n × F)] and W/At = [(I × am) / (d × n × F)]
Rate of oxidation is equals to the rate of reduction in corrosion.
Iron is corroding at a current density of 1.69*10-4 amp/cmWhat would be the corrosion rate in MDD?
Iron is corroding at a current density of 1.69*10-4 amp/cmWhat would be the corrosion rate in MPY?
_____ is used to measure the extent of uniform corrosion.
c) Both MPY and MDD
Corrosion rate of aluminum is _________ when compared with corrosion of mild steel in open oxygenated atmosphere.
d) very small
___________ will occur, if current pass from an electrode to electrolyte.
c) Oxidation and reduction
d) Anion formation
Oxidizing impurities in electrolyte increases the corrosion rate.
What are the uses of corrosion rate estimation of materials in daily life?
a) To predict the life time of a component
b) To compare the corrosive-resistant of materials
c) To increases the corrosion rate
d) To predict the life time and to compare the corrosive resistant of materials
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