Removal of Corrosive Substances :)

Corrosion control studies must compare the effectiveness of pH & alkalinity adjustment.

• TRUE

• FALSE

What is the definition of corrosion inhibitors?

• A) Chemicals that accelerate corrosion by forming metal complexes

• B) Chemicals that form protective barriers on metal surfaces to increase corrosion

• C) Chemicals that react with water to increase metal solubility

• D) Chemicals forming metal complexes that reduce corrosion, with passivation as the mechanism of corrosion control on the metallic surface

Which of the following are common corrosion inhibitors used in water systems?

• A) Orthophosphates and polyphosphates

• B) Polyorthophosphate blends and silicates

• C) Orthophosphates and silicates

• D) Polyphosphates and polyorthophosphate blends

What are the methods for measurement of corrosion rate?

• A. Coupon Weight-Loss Method

• B. Metal coupon method

• C. Loop system weight-loss method

The Langelier Saturation Index (LSI) is calculated using factors like pH, temperature, alkalinity, and calcium hardness.

• TRUE

• FALSE

The Calcium Carbonate Saturation Index helps predict whether water is likely to form scale or cause corrosion in pipes and equipment.

• TRUE

• FALSE

Corrosion of metallic and asbestos-cement systems can pose a significant threat to health due to the presence of contaminants like lead, cadmium, and asbestos in drinking water.

• FALSE

• TRUE

Iron can passivate, forming a protective oxide layer on its surface, reducing corrosion rates in specific conditions.

• FALSEEE

• TRUEEE

Adjusting calcium levels in water systems is a common strategy for controlling lead and copper corrosion.

• TRUE

• FALSE

The function of CaCO3 precipitation is to coat metallic pipes and reducing corrosion.

• FALS£

• TRU£