Corrosion prevention techniques

Question 1

Combination of two or more
metallic elements, especially to
give greater strength or resistance to corrosion.

Answer 1

Alloy

Question 2

For nitric acid service, the ___ are considered first due to its excellent resistance

Answer 2

stainless steels

Question 3

Use for caustic

Answer 3

Nickel and nickel alloys

Question 4

Chosen as a container or piping
material for very pure distilled water.

Answer 4

Tin

Question 5

Is a group of alloys of nickel (from 52 to 67%) and copper, with small amounts of iron, manganese, carbon, and silicon. It is usually used in handling Hydroflouric Acid.

Answer 5

Monel

Question 6

Use in hot hydrochloric acid.

Answer 6

Hastelloys (Chlorimets)

Question 7

Used in dilute sulfuric acid

Answer 7

Lead

Question 8

Used in nonstaining atmospheric pressure, handling hydrogen peroxide

Answer 8

Aluminum

Question 9

Use for ultimate resistance

Answer 9

Tantalum

Question 10

Use in concentrated sulfuric acid

Answer 10

steel

Question 11

Five general classes of nonmetallics

Answer 11

rubber, plastic, ceramic, carbon and graphite, wood

Question 12

Make the wall thickness _____ of the
required for the desired life of the
structure.

Answer 12

twice

Question 13

(T/F) Use welded joints than bolted or
riveted joints.

Answer 13

True

Question 14

(T/F) The equipment for heat transport
should be designed so that surface temperature varies as little as possible.

Answer 14

True

Question 15

(T/F) Designers should aim for complex geometry with less abrupt changes in dimensions.

Answer 15

False

Question 16

(T/F) Turbulent flow and impingement enhances erosion-corrosion, so the flow should be laminar or has minimal turbulence.

Answer 16

True

Question 17

(T/F) Components that are more prone
to corrosion should be easily inspected and replaced.

Answer 17

True

Question 18

(T/F) The most general rule for proper
design is to avoid homogeneity.

Answer 18

False

Question 19

In 1824, ____ reported that zinc and iron could be used to prevent the corrosion of copper.

Answer 19

Sir Humphry Davy

Question 20

Is a system for reducing corrosion by turning the entire structure into the cathode of a corrosion cell

Answer 20

Cathodic protection

Question 21

In this method, the metallic structure made the cathode by connecting it with galvanic anodes more electronegative
than the metal structure to be protected.

Answer 21

Galvanic / sacrificial anode method

Question 22

In this method, the metallic structure made the cathode by connecting the negative terminal of an external direct current power supply to the metallic
structure and the positive terminal to an inert anode.

Answer 22

Impressed current method

Question 23

Is a method employed to induce passivation in metals or alloys for the purpose of controlling corrosion.

Answer 23

Anodic protection

Question 24

Feasibility of anodic protection is firstly demonstrated and tested by ____ in 1954

Answer 24

C. Edeleanu

Question 25

(T/F) Anodic protection is usually applied
to metal exposed to extreme pH
environments.

Answer 25

True

Question 26

Is an electronic device that controls
and maintains a constant potential.

Answer 26

Potentiostat

Question 27

This stainless steel alloy contains molybdenum, which enhances its resistance to pitting and
crevice corrosion, making it suitable for
such harsh environments

Answer 27

Type 316