100+ Free AMPP Corrosion Technologist Practice Questions

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In mixed-potential theory, the corrosion potential (Ecorr) of a freely corroding metal is:

The potential at which the sum of all anodic current densities equals the sum of all cathodic current densities

The thermodynamic reversible potential of the most noble half-reaction

Always equal to the hydrogen electrode potential

The average of the open-circuit potentials of anodic and cathodic reactants

to track

2026 Statistics

Key Facts: AMPP Corrosion Technologist Exam

100

Exam Questions

AMPP Corrosion Technologist EPG (NACE-CTt-001)

180 min

Exam Time

AMPP CBT delivery

$385

CBT Exam Fee

AMPP 2024 fee schedule

4 years

Work Experience Required

AMPP eligibility

9 domains

Content Areas

AMPP EPG

3 years

Certification Validity

AMPP renewal policy

The AMPP Corrosion Technologist exam (NACE-CTt-001) has 100 multiple-choice questions, a 180-minute time limit, and costs $385 for CBT at Pearson VUE. It is the second rung in AMPP's Corrosion Technologist track and requires 4 years of verifiable corrosion-related experience plus the Ethics for the Corrosion Professional eCourse. The exam covers 9 domains with particular emphasis on cathodic protection (SP0169), protective coatings and surface preparation (NACE No. 3/SSPC-SP 6, MR0175), metallurgy, and internal corrosion control. Certification is valid for 3 years.

Sample AMPP Corrosion Technologist Practice Questions

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

1In mixed-potential theory, the corrosion potential (Ecorr) of a freely corroding metal is:

A.The potential at which the sum of all anodic current densities equals the sum of all cathodic current densities

B.The thermodynamic reversible potential of the most noble half-reaction

C.Always equal to the hydrogen electrode potential

D.The average of the open-circuit potentials of anodic and cathodic reactants

Explanation: Mixed-potential theory (Wagner and Traud) states that at Ecorr the total anodic current equals the total cathodic current, giving a net zero external current. The metal dissolution rate (icorr) is the magnitude of this balanced current. Ecorr is set kinetically, not just thermodynamically.

2The Tafel equation (η = a + b·log(i)) describes:

A.The concentration of reactants at steady state

B.Activation-controlled (charge-transfer) electrochemical kinetics at high overpotentials

C.The thickness of a passive film

D.The diffusion coefficient of oxygen

Explanation: The Tafel equation describes the linear relationship between overpotential (η) and log(current density) in the activation-controlled regime (sufficiently far from the equilibrium potential). The slope 'b' (Tafel slope, typically 60-120 mV/decade) reflects the charge-transfer kinetics of the reaction.

3The Stern-Geary equation icorr = B / Rp, where B = (ba·bc)/(2.303(ba+bc)), is used in:

A.Galvanic series ranking

B.Linear polarization resistance (LPR) corrosion rate measurement

C.Pourbaix diagram construction

D.Paint film thickness measurement

Explanation: Stern-Geary relates the polarization resistance Rp (slope of the polarization curve near Ecorr) to the corrosion current density icorr through the constant B that depends on both anodic and cathodic Tafel slopes. LPR probes exploit this to provide quick corrosion rate estimates in real time.

4An Evans (Pourbaix-like) diagram plotting E vs log(i) is used to:

A.Show the mass-loss of coupons

B.Graphically find icorr and Ecorr by locating the intersection of anodic and cathodic polarization curves

C.Measure the thickness of rust

D.Compare paint colors

Explanation: An Evans diagram plots the anodic branch (metal dissolution) and the cathodic branch (oxygen reduction or hydrogen evolution) as straight lines on E vs. log(i) coordinates. Where they cross defines Ecorr and icorr. Analytical solutions use Tafel approximations for each branch.

5Which of the following correctly describes the Pourbaix diagram for iron at 25°C?

A.A single corroding region over all pH

B.Regions of immunity (below about -0.62 V SHE), passivity (intermediate pH with oxide), and corrosion (low pH or very high pH)

C.Only a passive region

D.Only a corroding region

Explanation: Iron's Pourbaix diagram shows immunity at sufficiently negative potentials (about -0.62 V SHE), a passive region where Fe2O3 or Fe3O4 is thermodynamically stable (roughly pH 9-13), and corrosion regions at low pH (Fe2+ stable) and very high pH (HFeO2- stable). Cathodic protection targets immunity or at least significant cathodic polarization.

6NACE SP0169 lists a cathodic-protection criterion for buried carbon steel of:

A.Minimum -500 mV with respect to a zinc reference

B.Minimum -850 mV with respect to a copper/copper-sulfate reference (with voltage drops considered), OR 100 mV of cathodic polarization

C.Maximum +100 mV with respect to SHE

D.No specific criterion

Explanation: NACE SP0169 specifies several criteria; the most widely applied for buried or submerged steel are (1) -850 mV CSE instant-off (with IR drop considered) and (2) a minimum of 100 mV of cathodic polarization (either formation or decay). A negative-shift polarization criterion can also apply.

7Attenuation of CP current along a long, coated pipeline from a single drain point is governed by:

A.Ohm's law only

B.A distributed-parameter model in which potential decays approximately as E(x) = E0·cosh(αx)/cosh(αL), with α = sqrt(r/R)

C.Faraday's law only

D.Pourbaix thermodynamics

Explanation: Classic CP attenuation theory models the line as a distributed resistive-leakage network. The attenuation constant α depends on the longitudinal resistance per length (r) and the leakage resistance per length (R, driven by coating quality). Understanding α governs drain-point spacing and anode sizing for long lines.

8Which of the following is the MOST important reason to interrupt a CP rectifier during pipe-to-soil potential measurements?

A.To save electricity

B.To obtain an 'instant-off' reading that is substantially free of IR drop and represents the polarized potential

C.To reset the rectifier firmware

D.To allow the reference electrode to warm up

Explanation: IR drop in the soil causes the 'on' potential to appear more negative than the true polarized value. Interrupting the rectifier for a few hundred milliseconds while reading gives an 'instant-off' value free of most IR drop, so the operator can evaluate whether polarization meets NACE SP0169 criteria.

9In a galvanic anode CP design, the anode current output for a remote vertical anode is commonly estimated using:

A.Ohm's law with a lumped anode-to-earth resistance calculated by Dwight's formula (for vertical cylinders)

B.Faraday's law without resistance

C.Manufacturer's recommended voltage only

D.A trial-and-error soil moisture test

Explanation: Dwight's formula gives the resistance-to-earth of a single vertical cylindrical anode as a function of soil resistivity, anode length, and radius. Combined with the driving voltage (structure-to-anode), Ohm's law yields the expected current output. Multiple-anode beds use parallel-resistance corrections.

10Aluminum-zinc-indium (Al-Zn-In) galvanic anodes are preferred for seawater because:

A.They have lower driving voltage than zinc

B.They have very high capacity (~2700 A-h/kg) and indium activation maintains solubility of the oxide film

C.They are insoluble in seawater

D.They are impressed-current anodes

Explanation: Al-Zn-In alloys provide high theoretical and practical ampere-hour capacity (roughly 2700 A-h/kg), significantly higher than zinc (780 A-h/kg). Indium activates the aluminum oxide film so the anode stays dissolving rather than passivating. This is why platforms, vessels, and offshore structures use these anodes.

About the AMPP Corrosion Technologist Exam

The AMPP Corrosion Technologist Certification (NACE-CTt-001) is an advanced corrosion credential for practitioners with at least 4 years of verifiable corrosion-related experience. The 100-question CBT exam, delivered at Pearson VUE, assesses the theory of corrosion and corrosion prevention across cathodic protection, coatings, general corrosion, metallurgy, internal corrosion, safety, design, maintenance, and ethics. Certified Technologists apply corrosion theory to real-world problems under the direction of senior personnel.

Assessment

100 multiple-choice questions covering 9 domains (closed-book CBT)

Time Limit

180 minutes

Passing Score

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

Exam Fee

$385 (CBT) (AMPP (Association for Materials Protection and Performance))

AMPP Corrosion Technologist Exam Content Outline

~20%

Cathodic Protection

Impressed current and galvanic systems, -850 mV CSE criterion, polarization, IR drop, NACE SP0169, CP system design concepts, and field testing

~18%

Protective Coatings

Surface preparation (NACE No. 3/SSPC-SP 6, SP 10), coating selection and application, inspection, coating defects, and liquid vs powder systems

~14%

General Corrosion

Electrochemistry, mixed potential theory, Pourbaix diagrams, Evans diagrams, Tafel behavior, polarization resistance, and the 8 forms of corrosion

~12%

Metallurgy and Materials

Material properties, Fe-C phase diagram, stainless steels, nickel alloys, material selection, and NACE MR0175/ISO 15156 concepts for sour service

~12%

Internal Corrosion and Chemical Treatment

Corrosion inhibitors (anodic, cathodic, mixed), scale and microbiological control, oxygen scavengers, monitoring coupons, and chemical injection

~8%

Design and Material Selection

Design for corrosion control, system layout, material compatibility, allowance calculations, and integration of CP with coatings

~8%

Maintenance and Monitoring

Rectifier maintenance, anode replacement, coupon and ER probe monitoring, field surveys, and preventive maintenance schedules

~5%

Safety

General safety, confined space, coating application safety, PPE, H2S awareness, and hot work procedures

~3%

Ethics and Professional Responsibility

AMPP Code of Ethics, regulatory roles, documentation integrity, and professional decision-making

How to Pass the AMPP Corrosion Technologist Exam

What You Need to Know

Passing score: Pass/Fail (cut score set by AMPP subject matter experts)
Assessment: 100 multiple-choice questions covering 9 domains (closed-book CBT)
Time limit: 180 minutes
Exam fee: $385 (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 Technologist Study Tips from Top Performers

1Master mixed potential theory and Evans diagrams — the foundation of polarization-based CP calculations

2Know NACE SP0169 inside out, especially the three CP criteria (-850 mV CSE 'off', -850 mV CSE with IR drop considered, 100 mV polarization shift)

3Understand Tafel slopes, the Stern-Geary equation (B = ba*bc / 2.303(ba+bc)), and how LPR estimates corrosion rate

4Memorize Pourbaix diagrams for iron showing immunity, passivity, and corrosion regions and what each means operationally

5Study NACE No. 3/SSPC-SP 6 (commercial blast) and SP 10 (near-white) surface preparation standards and their profile requirements

6Know NACE MR0175/ISO 15156 partial pressure thresholds (0.05 psi H2S) for sour service material selection

7Understand inhibitor chemistry: anodic (chromates, nitrites) shift Ecorr noble, cathodic (phosphates, zinc) shift Ecorr active

8Review the galvanic series in seawater and calculate driving potentials for galvanic cells

Frequently Asked Questions

What is the AMPP Corrosion Technologist certification?

The AMPP Corrosion Technologist (NACE-CTt-001) is an advanced corrosion certification from the Association for Materials Protection and Performance (formerly NACE International). It is designed for practitioners with at least 4 years of verifiable corrosion-related experience who understand corrosion theory and can apply it to real-world problems across cathodic protection, coatings, metallurgy, and internal corrosion. The credential is valid for 3 years.

How many questions are on the Corrosion Technologist exam?

The written exam contains 100 multiple-choice questions delivered via computer-based testing at Pearson VUE. You have 180 minutes to complete it, including 4 minutes for the NDA and 6 minutes for the system tutorial. The test code is NACE-CTt-001, and the exam is closed-book and pass/fail.

How much does the exam cost?

The Corrosion Technologist CBT exam fee is $385 per the AMPP June 2024 fee schedule. Retake fees are also $385, and candidates must wait 30 days from the initial attempt before scheduling a first retake (4 months for subsequent attempts). Application fees are $0 for AMPP members and $150 for non-members.

What are the eligibility requirements?

Candidates need 4 years of verifiable corrosion-related work experience, an approved Corrosion Technologist application, successful completion of the Ethics for the Corrosion Professional eCourse (or equivalent), and successful completion of the Corrosion Technologist exam. An alternative path allows the Corrosion Technician credential (or Corrosion Foundations Micro-Credential) plus one certification from Menu A and one course from Menu B.

What topics does the Corrosion Technologist exam cover?

The exam covers 9 domains: Cathodic Protection (including NACE SP0169), Protective Coatings (surface preparation standards such as NACE No. 3/SSPC-SP 6), General Corrosion (electrochemistry, Pourbaix, Tafel), Metallurgy (MR0175, galvanic series), Internal Corrosion and Chemical Treatment, Design, Maintenance, Safety, and Ethics. Candidates must understand both theory and practical application.

How is this different from the Senior Corrosion Technologist?

The Corrosion Technologist is 100 questions in 180 minutes with 4 years of experience required. The Senior Corrosion Technologist (NACE-SCT-001) is 140 questions in 240 minutes and requires 8 years of experience (or a Bachelor's degree in physical sciences/engineering plus 4 years in responsible charge). The Senior exam emphasizes design-level decisions and independent judgment.

How do I prepare for the exam?

AMPP publishes a free Exam Preparation Guide (EPG) for the Corrosion Technologist. Core study materials include the AMPP Basic Corrosion Manual, Peabody's Control of Pipeline Corrosion (3rd ed.), Handbook of Corrosion Engineering, Corrosion Prevention by Protective Coatings, NACE Direct Assessment Manual, and relevant standards (SP0169, MR0175, SP0285, TM0172). Taking the Basic Corrosion course and practicing sample questions are both strongly recommended.