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Corrosion Control


Quiz Questions

1.Which of the following methods are used to protect metals against corrosion?
Inhibitors
Surface Coating
Electrical protection
All the above
2. A hot dipped galvanized coating will provide greater corrosion protection to steel when compared to that of an electroplated product.
True
False
3.The following figure reresents _____________.?
PDH Course - Corrosion Control 1
Basic concept of hot dipped tin plating process
Galvanization
Hot dip of Zn
4.Oxidation, Phosphating, Enamels processes etc comes under _______________.?
Methods of Inorganic coating
Methods of organic coating
5.Chromate inhibitors are the most effective of the anodic inhibitors however they are toxic to most organisms.
True
False
6.If the Soil resistivity range (ohm-cm) is 10,000 to 30,000 then Corrosivity is likely to be _____________.?
Severe
Moderate to severe
Mild
Not likely
7.The following figure represents _____________.?
PDH Course - Corrosion Control 2
Bad design of bolted joint
Good design of bolted joint
8.The decrease in the rate of corrosion beyond 80 C is attributed to the __________ in O2 solubility in water.
Decrease
Increase
Steadiness
9._______________ appears when the chemical reaction step is the controlling step and is defined as the retardation of an electrochemical process due to the slowness of the charge transfer step.
Concentration Polarization
Activation Polarization
Reacting Polarization
None of the above
10.Which of the following metals show passive behavior?
Cr
Fe
Ni
All the above