100+ Free AMPP Senior Corrosion Technologist Practice Questions

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In the de Waard-Milliams model for CO2 corrosion of carbon steel, which combination of parameters has the STRONGEST influence on predicted corrosion rate?

Color and viscosity of the fluid

CO2 partial pressure, temperature, pH, and flow velocity (with corrosion-product film formation)

Pipe length only

Time of day

to track

2026 Statistics

Key Facts: AMPP Senior Corrosion Technologist Exam

140

Exam Questions

AMPP SCT EPG (NACE-SCT-001)

240 min

Exam Time

AMPP CBT delivery

$385

CBT Exam Fee

AMPP 2024 fee schedule

8 years

Experience Required

AMPP eligibility (or BS + 4 yrs)

6 domains

Content Areas

AMPP EPG

3 years

Certification Validity

AMPP renewal policy

The AMPP Senior Corrosion Technologist exam (NACE-SCT-001) has 140 multiple-choice questions with a 240-minute (4-hour) time limit and costs $385 via CBT at Pearson VUE. It is a senior-level credential requiring 8 years of verifiable corrosion experience (including 4 in responsible charge) or a Bachelor's degree in physical sciences/engineering plus 4 years in responsible charge. The exam covers 6 domains: metallurgy, chemical treatment, cathodic protection, coatings, internal corrosion, and planning/safety, at a design-level depth emphasizing independent judgment. Certification is valid for 3 years.

Sample AMPP Senior Corrosion Technologist Practice Questions

Try these sample questions to test your AMPP Senior 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 the de Waard-Milliams model for CO2 corrosion of carbon steel, which combination of parameters has the STRONGEST influence on predicted corrosion rate?

A.Color and viscosity of the fluid

B.CO2 partial pressure, temperature, pH, and flow velocity (with corrosion-product film formation)

C.Pipe length only

D.Time of day

Explanation: The de Waard-Milliams (and de Waard-Lotz) models compute sweet corrosion rate as a strong function of CO2 partial pressure, temperature, pH, and flow velocity, with film-formation factors that reduce rate when protective FeCO3 scales form. At higher temperature (>60°C) FeCO3 stability reduces predicted rates; below 60°C the film is less protective.

2Which parameter defines the 'sour service' threshold per NACE MR0175/ISO 15156 for carbon and low-alloy steels?

A.Temperature > 65°C

B.H2S partial pressure ≥ 0.05 psi (0.3 kPa) in the gas phase

C.Pressure > 1000 psi total

D.CO2 partial pressure > 1 psi

Explanation: MR0175/ISO 15156-2 uses a hydrogen sulfide partial pressure of 0.05 psi (0.3 kPa) as the sour service threshold. Above this value, materials must be qualified under the standard for sulfide stress cracking (SSC), HIC, SOHIC, and stepwise cracking resistance. Regions of severity are mapped on the pH-partial-pressure diagrams.

3According to MR0175, which hardness limit is usually specified for carbon and low-alloy steels in sour service to resist SSC?

A.HRC 32 max

B.HRC 22 max (HV 248 max)

C.HRC 45 max

D.No limit

Explanation: MR0175 specifies a maximum hardness of HRC 22 (approximately HV 250 or HB 237) for most carbon and low-alloy steels in sour service, including weld HAZ. Specific microstructure requirements also apply. Higher hardness correlates with SSC susceptibility; tempering and PWHT are used to meet the limit.

4Which test method is most commonly used to qualify carbon steel linepipe for HIC resistance per MR0175?

A.ASTM G48 Method A

B.NACE TM0284

C.ASTM D4417

D.ASTM G1

Explanation: NACE TM0284 (Evaluation of Pipeline and Pressure Vessel Steels for Resistance to Hydrogen-Induced Cracking) is the standard HIC test. Specimens are exposed to H2S-saturated NACE solution A (or B) for 96 hours and sectioned; Crack Length Ratio (CLR), Crack Thickness Ratio (CTR), and Crack Sensitivity Ratio (CSR) are reported. Pass thresholds are project-specified.

5Which test qualifies carbon steels for SSC resistance per MR0175?

A.NACE TM0177

B.ASTM E8

C.API 5L2

D.ASTM D4541

Explanation: NACE TM0177 (Laboratory Testing of Metals for Resistance to SSC and SCC in H2S Environments) provides four methods (A tensile, B bent-beam, C C-ring, D double-cantilever-beam) for qualifying materials in sour service. Method A (uniaxial tensile) applied at 72-80% of SMYS in NACE solution A is most common.

6Which of the following is the PRIMARY reason duplex stainless steels are preferred over austenitic stainless in chloride-containing sour service?

A.Lower cost

B.Higher chloride SCC resistance and better strength at similar or higher PREN

C.Higher thermal conductivity

D.Non-magnetic in all conditions

Explanation: Duplex stainless steels (e.g., 22Cr-5Ni-3Mo) combine the chloride-SCC resistance of ferritic steels with the mechanical strength of austenitic. For chloride+H2S service within MR0175 limits, duplex and super-duplex grades outperform standard austenitic. They also offer higher yield strength allowing thinner walls.

7Which CP criterion is considered the most conservative for buried carbon steel per NACE SP0169?

A.-800 mV CSE on

B.-850 mV CSE instant-off (or with IR drop considered)

C.A polarization shift of 50 mV

D.-700 mV CSE on

Explanation: The -850 mV CSE instant-off criterion (with IR drop considered) is the most widely applied and conservative criterion for buried carbon steel. It represents polarization into the passive/immunity region of iron's Pourbaix diagram. The 100 mV polarization shift criterion is an alternative when -850 mV is impractical.

8For deep well impressed-current anode design, 'coke breeze' serves which primary purpose?

A.Insulate the anode from the borehole

B.Reduce anode consumption by carrying current via carbon, improve current distribution, and lower bed-to-earth resistance

C.Act as a pH buffer

D.Provide mechanical support only

Explanation: Coke breeze (petroleum coke) backfill around impressed-current anodes provides a conductive path, extends anode life (current preferentially consumes the coke rather than the MMO or HSCI anode), and lowers the overall bed-to-earth resistance. A well-designed deep well bed can last 20+ years with modest current output.

9Which of the following is the MOST common method to mitigate induced AC on a pipeline parallel to an HV transmission corridor?

A.Install additional rectifiers

B.Install zinc ribbon anodes along the pipeline combined with solid-state decouplers and grounding mats at aboveground features

C.Move the pipeline

D.Increase pipe thickness

Explanation: AMPP SP21424 and CEPA AC mitigation guidelines recommend distributed zinc ribbon anodes along the parallel section, solid-state decouplers (block DC, pass AC to ground), and ground mats at valve stations, test stations, and above-ground fittings. Goals: safety (touch voltages under 15 V AC) and corrosion (AC current density under ~30-100 A/m2 depending on coating).

10Which of the following is the CORRECT order of severity in a sour service environment for carbon steel SSC risk?

A.Region 3 (most severe) > Region 2 > Region 1

B.Region 1 (most severe) > Region 2 > Region 3

C.Severity is independent of region

D.Region 2 is always worst

Explanation: MR0175/ISO 15156-2 maps SSC severity using a pH vs. H2S partial pressure plot divided into Regions 0 (sweet), 1 (mild sour), 2 (intermediate), and 3 (severe sour). Region 3 is most severe. Higher regions require more stringent material qualification or material substitution.

About the AMPP Senior Corrosion Technologist Exam

The AMPP Senior Corrosion Technologist Certification (NACE-SCT-001) is a senior-level credential for corrosion experts capable of working independently, making strategic decisions, and leading with minimal supervision. The 140-question, 240-minute CBT exam assesses advanced metallurgy, chemical treatment, cathodic protection design, coating systems, internal corrosion theory, and planning/safety. Candidates need 8 years of corrosion experience (with 4 in responsible charge) or a bachelor's degree in physical sciences/engineering plus 4 years in responsible charge.

Assessment

140 multiple-choice questions covering 6 domains (closed-book CBT)

Time Limit

240 minutes (4 hours)

Passing Score

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

Exam Fee

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

AMPP Senior Corrosion Technologist Exam Content Outline

~22%

Cathodic Protection

CP system design, attenuation calculations, anode bed layout, interference mitigation, IR drop considerations, and advanced criteria from NACE SP0169

~20%

Metallurgy and Material Selection

Advanced metallurgy, phase diagrams, stainless steel families, nickel alloys, cladding, MR0175/ISO 15156 sour service selection, and HIC/SSC resistance

~18%

Protective Coatings

Coating system selection, lining design, surface preparation standards, inspection plans, CUI mitigation, and coating failure analysis

~18%

Internal Corrosion

Internal corrosion mechanisms (CO2 'sweet', H2S 'sour', MIC, oxygen, under-deposit), corrosion modeling, probe monitoring, and pipeline integrity

~12%

Chemical Treatment

Inhibitor selection and field deployment, biocide programs, scale control, oxygen scavengers, chemical injection design, and treatment monitoring

~10%

Planning and Safety

Project planning, risk-based inspection concepts, corrosion management programs, H2S safety, confined space, and hot work planning

How to Pass the AMPP Senior Corrosion Technologist Exam

What You Need to Know

Passing score: Pass/Fail (cut score set by AMPP subject matter experts)
Assessment: 140 multiple-choice questions covering 6 domains (closed-book CBT)
Time limit: 240 minutes (4 hours)
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 Senior Corrosion Technologist Study Tips from Top Performers

1Master NACE MR0175/ISO 15156 partial pressure thresholds for sour service and understand HIC, SSC, and SOHIC mechanisms

2Understand CP system design including attenuation equations, anode bed resistance (Dwight's formula), and rectifier sizing

3Know CO2 corrosion modeling fundamentals (de Waard-Milliams) and how pH, temperature, and velocity affect sweet corrosion

4Study stress corrosion cracking mechanisms: chloride SCC in austenitic stainless, caustic SCC in carbon steel, and hydrogen embrittlement

5Review Risk-Based Inspection (RBI) concepts from API 580/581 and corrosion integrity management programs

6Practice Pourbaix, Evans, and Tafel interpretation for predicting behavior of mixed metal systems

7Understand stray current interference detection, mitigation (bonds, insulators), and testing (close-interval surveys)

8Know inhibitor field deployment: batch, continuous, squeeze treatments, and how to monitor residuals and effectiveness

Frequently Asked Questions

What is the AMPP Senior Corrosion Technologist certification?

The AMPP Senior Corrosion Technologist (NACE-SCT-001) is a senior-level corrosion certification from the Association for Materials Protection and Performance. It validates the ability to work independently, make strategic corrosion-control decisions, and lead under minimal supervision across metallurgy, chemical treatment, CP, coatings, internal corrosion, and safety planning. The credential is valid for 3 years and requires renewal with documented professional development hours.

How many questions are on the Senior Corrosion Technologist exam?

The exam contains 140 multiple-choice questions delivered via computer-based testing at Pearson VUE. You have 240 minutes (4 hours) to complete it, covering 6 domains. The test code is NACE-SCT-001, and the exam is closed-book and pass/fail. This is the longest written exam in AMPP's Corrosion Technologist track.

How much does the Senior Corrosion Technologist exam cost?

The CBT exam fee is $385 per the AMPP June 2024 fee schedule — the same price as the Corrosion Technologist exam. Retake fees are also $385, with a mandatory 30-day wait after the initial attempt and a 4-month wait for subsequent retakes. AMPP members pay $0 in application fees; non-members pay $150.

What are the eligibility requirements?

Candidates need 8 years of verifiable corrosion-related work experience with 4 years in 'responsible charge' (requiring initiative, technical ability, and independent judgment), OR a Bachelor's degree in physical sciences or engineering with 4 years in responsible charge. Additionally, candidates must submit an approved Senior Corrosion Technologist application and complete the Ethics for the Corrosion Professional eCourse.

What topics does the Senior Corrosion Technologist exam cover?

The exam spans 6 domains: Metallurgy (advanced material selection, MR0175), Chemical Treatment (inhibitor deployment, biocides), Cathodic Protection (system design, interference), Coatings (lining design, CUI), Internal Corrosion (CO2/H2S, modeling), and Planning and Safety (project planning, risk-based inspection, H2S safety). The depth is design-level, expecting candidates to make strategic judgments.

How does this compare to the Corrosion Technologist exam?

The Corrosion Technologist is 100 questions in 180 minutes with 4 years of experience required, covering 9 domains at an application level. The Senior Corrosion Technologist is 140 questions in 240 minutes with 8 years of experience (or BS + 4 years), covering 6 domains at a design and strategic-decision level. Both cost $385 CBT but the Senior exam is noticeably longer and more demanding.

How do I prepare for the exam?

Download the free AMPP Exam Preparation Guide for Senior Corrosion Technologist. Core references include the AMPP Corrosion Engineer's Reference Book, Peabody's Control of Pipeline Corrosion (3rd ed.), Uhlig's Corrosion Handbook, Fontana's Corrosion Engineering, NACE MR0175/ISO 15156, NACE SP0169, SP0285, TM0172, and Corrosion Basics. Candidates should also review H2S and sour service material specifications and advanced CP design methods.