100+ Free AMPP Corrosion Technician Practice Questions

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What is the basic definition of corrosion as used in AMPP/NACE materials?

The physical wear of a metal from abrasive particles

The destructive attack of a material, usually metallic, by reaction with its environment

The thermal expansion of metallic components above their yield point

The cold-working of steel during forming operations

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2026 Statistics

Key Facts: AMPP Corrosion Technician Exam

Exam Questions

AMPP Corrosion Technician EPG

120 min

Exam Time

AMPP (NACE-CTn-001)

$275

CBT Exam Fee

AMPP 2024 fee schedule

2 years

Work Experience Required

AMPP eligibility

5 domains

Content Areas

AMPP EPG

3 years

Certification Validity

AMPP renewal policy

The AMPP Corrosion Technician exam has 49 multiple-choice questions, a 120-minute time limit, and costs $275 for CBT delivery at Pearson VUE. It is the entry-level certification in AMPP's Corrosion Technologist track, requiring 2 years of corrosion-related work experience plus completion of the Ethics for the Corrosion Professional eCourse. The exam heavily weights Corrosion Control (33-37%) covering cathodic protection, coatings, general corrosion, and inhibitors. Certification is valid for 3 years and is a building block toward the Corrosion Technologist credential.

Sample AMPP Corrosion Technician Practice Questions

Try these sample questions to test your AMPP Corrosion Technician exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the basic definition of corrosion as used in AMPP/NACE materials?

A.The physical wear of a metal from abrasive particles

B.The destructive attack of a material, usually metallic, by reaction with its environment

C.The thermal expansion of metallic components above their yield point

D.The cold-working of steel during forming operations

Explanation: AMPP (and NACE before it) defines corrosion as the destructive attack of a material — usually a metal — by chemical or electrochemical reaction with its environment. The key word is 'electrochemical' for aqueous corrosion: oxidation of the metal at the anode and reduction of an oxidizer (typically oxygen or hydrogen ion) at the cathode.

2In a simple corrosion cell, which of the following MUST be present for corrosion to proceed?

A.Anode, cathode, electrolyte, and metallic path

B.Cathode and dry surface only

C.Anode and metallic path only

D.Electrolyte and oxidizer only

Explanation: Aqueous corrosion requires four components: (1) an anode where oxidation occurs, (2) a cathode where reduction occurs, (3) an electrolyte that carries ionic current, and (4) a metallic path that carries electronic current between anode and cathode. Removing any one of these stops the corrosion reaction.

3At the anode of a corroding iron surface, what is the primary half-reaction?

A.O2 + 2H2O + 4e- → 4OH-

B.Fe → Fe2+ + 2e-

C.2H+ + 2e- → H2

D.Fe3+ + e- → Fe2+

Explanation: At the anode, iron is oxidized: Fe → Fe2+ + 2e-. Electrons released flow through the metallic path to the cathode. This is the metal-loss step that defines corrosion.

4Which cathodic reaction is dominant in aerated, neutral-pH water such as soil moisture or seawater?

A.Hydrogen evolution: 2H+ + 2e- → H2

B.Oxygen reduction: O2 + 2H2O + 4e- → 4OH-

C.Metal reduction: Fe2+ + 2e- → Fe

D.Chloride oxidation: 2Cl- → Cl2 + 2e-

Explanation: In aerated, neutral or alkaline environments, the dominant cathodic reaction is oxygen reduction (O2 + 2H2O + 4e- → 4OH-). Hydrogen evolution becomes important only in acidic or deaerated systems. This is why most soil and seawater corrosion of carbon steel is oxygen-driven and diffusion-limited.

5Faraday's law relates mass loss from corrosion to which of the following?

A.Applied voltage only

B.The total charge passed (current × time) and the equivalent weight

C.The temperature of the electrolyte only

D.The surface area only

Explanation: Faraday's law states that the mass (W) dissolved is proportional to current × time × equivalent weight divided by Faraday's constant (96,485 C/equivalent). So W = (I·t·M)/(n·F). This is the fundamental relation that converts corrosion current to a corrosion rate in mils/year or mm/year.

6In the galvanic series in seawater, which metal is MORE active (anodic) relative to carbon steel?

A.Copper

B.Platinum

C.Zinc

D.Stainless steel 316 (passive)

Explanation: Zinc is more active (more negative open-circuit potential) than carbon steel in seawater and will preferentially corrode when coupled to steel. This is why zinc is used as a galvanic (sacrificial) anode for cathodic protection of steel structures in seawater.

7A Pourbaix (E-pH) diagram for iron shows regions of:

A.Only corrosion

B.Immunity, passivity, and corrosion

C.Anodic, cathodic, and reference only

D.Only passive film growth

Explanation: A Pourbaix diagram plots potential (E) versus pH and shows the thermodynamically stable species as a function of those variables. For iron, it identifies three operational regions: immunity (metallic Fe is stable), passivity (protective oxide or hydroxide is stable), and corrosion (soluble Fe ions are stable).

8Ohm's law (V = IR) is used in cathodic protection to calculate:

A.Faraday conversion of current to mass

B.The voltage drop across the electrolyte resistance (IR drop)

C.The pH of the soil

D.The saturation potential of the reference electrode

Explanation: Ohm's law is used in CP work primarily to calculate the IR drop — the voltage drop through the electrolyte (soil or water) between the structure and the reference electrode. Accurate structure-to-electrolyte potential measurements must account for (or eliminate) IR drop, which is the basis for 'instant-off' readings per NACE SP0169.

9Uniform corrosion is characterized by:

A.Attack concentrated at small localized points

B.Approximately even metal loss across a large surface

C.Selective attack along grain boundaries only

D.Cracks propagating under tensile stress

Explanation: Uniform (general) corrosion is approximately even attack over the entire exposed surface. It is the most easily predicted form and is usually handled with a corrosion allowance in design. The other options describe pitting, intergranular corrosion, and stress corrosion cracking respectively.

10Galvanic corrosion between two dissimilar metals is most severe when:

A.The metals are close in the galvanic series

B.There is no electrolyte present

C.The anode area is small compared to the cathode area

D.The cathode is painted and the anode is bare

Explanation: Galvanic corrosion is most severe when a small anode is coupled to a large cathode (unfavorable area ratio). All the corrosion current from a large cathode must be carried by a small anode, producing very high local current density and rapid penetration. Coating the anode (not the cathode) worsens this; the guideline is to coat the cathode or both.

About the AMPP Corrosion Technician Exam

The AMPP Corrosion Technician Certification validates foundational corrosion knowledge for professionals with at least 2 years of verifiable corrosion-related field experience. The 49-question CBT exam (NACE-CTn-001) is delivered at Pearson VUE test centers and covers corrosion fundamentals, forms of corrosion, materials, corrosion control (CP, coatings, inhibitors), and inspection/documentation/testing. Candidates operate under the direction of more senior technologists.

Assessment

49 multiple-choice questions covering 5 domains (closed-book; some items may have more than one correct answer)

Time Limit

120 minutes

Passing Score

Pass/Fail (cut score set by AMPP subject matter experts)

Exam Fee

$275 (CBT) (AMPP (Association for Materials Protection and Performance))

AMPP Corrosion Technician Exam Content Outline

33-37%

Corrosion Control

Cathodic protection fundamentals (galvanic and impressed current, -850 mV CSE criterion, NACE SP0169), protective coatings, general corrosion mitigation, and corrosion inhibitors

18-22%

Forms of Corrosion and Corrosion Mechanisms

Environmental, external, and internal corrosion including uniform attack, galvanic, pitting, crevice, intergranular, SCC, erosion-corrosion, and MIC

16-20%

Corrosion Fundamentals

Corrosion definition, electrochemical cells, Faraday's law, galvanic series, Ohm's law, parts of a corrosion cell, Pourbaix diagrams, and half-cell reactions

15-19%

Inspection, Recordkeeping, and Testing

Field inspection techniques, documentation practices, pipe-to-soil potential measurement, coating thickness testing, and corrosion rate monitoring

8-12%

Materials

Material properties, material selection for corrosive service, basic metallurgy, and galvanic series application

How to Pass the AMPP Corrosion Technician Exam

What You Need to Know

Passing score: Pass/Fail (cut score set by AMPP subject matter experts)
Assessment: 49 multiple-choice questions covering 5 domains (closed-book; some items may have more than one correct answer)
Time limit: 120 minutes
Exam fee: $275 (CBT)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

AMPP Corrosion Technician Study Tips from Top Performers

1Master the basic electrochemical cell: anode, cathode, electrolyte, metallic path — and know what happens at each

2Memorize the galvanic series in seawater and know which metals are anodic vs cathodic relative to each other

3Understand Faraday's law (96,500 coulombs per equivalent) and how it relates to corrosion rate and CP current requirements

4Know the -850 mV CSE cathodic protection criterion from NACE SP0169 for buried steel structures

5Study the 8 forms of corrosion (Fontana): uniform, galvanic, crevice, pitting, intergranular, selective leaching, erosion-corrosion, SCC

6Review surface preparation standards: SSPC-SP 1 (solvent clean), SP 6/NACE No. 3 (commercial blast), SP 10/NACE No. 2 (near-white)

7Understand corrosion inhibitor categories (anodic, cathodic, mixed) and how they interrupt the corrosion cell

8Practice reading Pourbaix diagrams for iron to identify regions of immunity, passivity, and corrosion

Frequently Asked Questions

What is the AMPP Corrosion Technician certification?

The AMPP Corrosion Technician is an entry-level corrosion certification offered by the Association for Materials Protection and Performance (formerly NACE International). It is designed for professionals with at least 2 years of verifiable corrosion-related work experience who perform routine corrosion tasks under the direction of more senior technologists. The credential is valid for 3 years and requires renewal with documented professional development hours.

How many questions are on the Corrosion Technician exam?

The Corrosion Technician written exam (NACE-CTn-001) contains 49 multiple-choice questions delivered via computer-based testing at Pearson VUE. You have 120 minutes to complete the exam, which includes 4 minutes for the non-disclosure agreement and 6 minutes for the system tutorial. The test is closed-book, and some items may have more than one correct answer.

How much does the Corrosion Technician exam cost?

The AMPP Corrosion Technician exam costs $275 via computer-based testing at Pearson VUE test centers per the June 2024 AMPP fee schedule. Retake fees are also $275. A separate application fee of $150 applies for non-members (no application fee for AMPP members).

What are the eligibility requirements?

Candidates need at least 2 years of verifiable corrosion-related work experience, an approved Corrosion Technician application, and successful completion of the AMPP Ethics for the Corrosion Professional eCourse (or an equivalent). Alternatively, candidates can complete the AMPP Basic Corrosion Course or e-Course and pass the Basic Corrosion Exam to qualify.

What topics does the exam cover?

The exam covers 5 domains: Corrosion Fundamentals (electrochemistry, Faraday's law, galvanic series, Pourbaix), Forms of Corrosion and Mechanisms (environmental, external, internal), Materials (selection, metallurgy), Corrosion Control (cathodic protection, coatings, general corrosion, inhibitors — the heaviest-weighted domain at 33-37%), and Inspection/Recordkeeping/Testing.

How is this different from the Corrosion Technologist exam?

The Corrosion Technician is entry-level (2 years experience, 49 questions, 120 minutes, $275). The Corrosion Technologist (NACE-CTt-001) is the next step up, requiring 4 years of experience and covering 100 multiple-choice questions in 180 minutes at $385 with deeper theory across 9 domains including design, safety, and ethics.

How do I schedule the Corrosion Technician exam?

After your application is approved by AMPP, log into your My Certification Portal and select 'Schedule/Manage exams' to book a computer-based test at any Pearson VUE test center worldwide. Bring two forms of identification on exam day. The exam is closed-book — calculators are provided within the CBT interface.