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Cross sectional examination showing crack branches from corrosion pit

Cross sectional view of stress corrosion cracking (SCC)

Corrosion Failure Analysis, Prevention and Expert Witness Services in Singapore

What is corrosion?

Corrosion is degradation of metals through chemical or electrochemical reaction between metals and its environment. Typical example is oxidation of iron and steels, resulting in rust or corrosion products.

Corrosion occurs in all industries from automotive and aerospace to infrastructure, construction, marine, petroleum, oil & gas, power, paper making, food processing, bioengineering, and pharmaceuticals. Corrosion is costly, dangerous, wasteful, and unsightly in some cases.

What is corrosion engineering?

The core of corrosion engineering is corrosion control and prevention, which includes conducting failure analysis and investigation on corroded parts to understand corrosion mechanisms and corrosion causes, and studying corrosion preventive methods to minimize or control corrosion.

Corrosion failure analysis

Corrosion failure analysis (or corrosion failure investigation)is to adopts systematic analysis approach to determine root cause(s) and mechansim(s) of corrosion failure and provide counter measures to prevent similar corrosion failure recurrence.

Corrosion expert witness

Corrosion expert witness is a person with specialised and extensive knowledge in corrosion based on training, study or experience. Engaging corrosion expert witness services can be from the legal, insurance and industrial sectors as well as government agencies for assistance in settling lawsuits, litigations, arbitrations, safety related prosecution, construction disputes and insurance claims related to corrosion issues.

Corrosion expert witness may be required in litigation proceedings including Courts and tribunals to assist them in reaching a decision and justifications when the Courts require expert evidence. Corrosion expert witness provides expert opinions and evidences in their testimony mostly based on forensic investigation or analysis on the subject corrosion issues as well as scientific knowledge.

More details about expert witness, please refer to Expert Witness Services.

Corrosion process

As corrosion is chemical or electrochemical reaction between metals and environment, electrochemical cell(s) are formed in corrosion process. Four elements must be present for corrosion to occur.

  1. Anode: The site of metal where oxidation (corrosion) occurs
  2. Cathode: The site of metal where corrosion does not form
  3. Metallic pathway: Provides the flow of electrons from anode to cathode
  4. Electrolyte: A liquid that contains charged particles and allows ions to flow from cathode to anode

The interaction between these four elements is known as the corrosion cell. Three elements of corrosion are already present in most metals: anode, cathode and metallic pathway. Only missing element is the electrolyte that comes from the atmosphere or chemicals.

EMAIL or Call (+65)81380509 to contact UTC corrosion experts for assistance in consultation of corrosion problems.

UTC's corrosion investigation and analysis services

UTC team consists of corrosion experts with more than 35 years of relevant industrial and research experience as well as qualifications. The key staff has successfully led and completed thousands of consultation projects in forensic analysis, accident investigation, failure analysis, corrosion investigation & analysis, condition assessment and expert witness services for aerospace, marine, petrochemical, electronic and microelectronic, construction, amusement, oil & gas, transportation industries and governmental agencies including Ministry of Defence (Singapore), Republic of Singapore Air Force (RSAF), Defence Science and Technology Agency (DSTA), Singapore Civil Defence Force (SCDF), Ministry of Manpower (MOM), Hyundai Engineering and Construction (Korean), Public Utilities Board (PUB), The Straits Times, SBS Transit, High Court, State Courts, China Taiping Insurance, Rajah & Tann, WongPartnership, Universal Terminal, Singapore Navy, SMRT, RWS, Shell, ST Aerospace, Eagle Services Asia, SIA Engineering, HP, Dell, ST Marine, Takenaka Corporation (Japan) and Sembawang Shipyard, etc. Many projects are related to corrosion analysis and investigation.

corrosion mechanism of steel water reaction causing corrosion pit

Pitting corrosion of steel reaction with water

Typical corrosion related consultation projects

    UTC experts had successfully accomplished thousands of failure analysis and accident investigation projects, some typical cases related to corrosion are listed as follows:
  • Failure analysis on crevice corrosion of roller coaster vehicle spindle
  • Forensic investigation on stainless steel wire rope snapping or breaking (fracture by stress corrosion cracking) of mass rapid transport system/ subway accident
  • Failure analysis on corrosion and tarnish of electronic component leads
  • Investigation on silver migration between PCB connecting fingers
  • Failure analysis on aircraft air foil corrosion
  • Investigation on corrosion caused by paint and coating failures
  • Failure analysis and investigation on wire rope corrosion damage of crane and expert witness services
  • Failure analysis on corrosion of large batch of doors
  • Investigation on propeller bolt (fractured by corrosion fatigue) of hovercraft accident
  • Failure analysis investigation on vehicle track bolt corrosion failure
  • Forensic investigation on cooling pipe corrosion of jack-up rig
  • Failure analysis on manhole corrosion damages
  • Forensic investigation on corrosion and fracture of galvanized bolts in roller coaster track
  • Failure analysis of oil an gas pipeline corrosion and expert witness services
  • Investigation on corrosion of building structures etc.
corrosion of metals

Investigation on metal sheet corrosion

UTC expert areas in corrosion engineering and expert witness

Common corrosion forms and mechanisms

Our corrosion failure analysis and accident investigation were related to following failure types and mechanisms:

  • general corrosion or uniform corrosion
  • stress corrosion cracking (SCC)
  • localised corrosion
  • under-deposit corrosion
  • galvanic corrosion
  • pitting corrosion
  • crevice corrosion
  • intergranular corrosion
  • corrosion fatigue
  • leaching corrosion
  • micro organism corrosion (MIC)
  • etc.

    Corrosion prevention / control methods

    • Corrosion prevention by proper design
    • Corrosion control by materials selection
    • Corrosion prevention by protective coatings
    • Corrosion control by inhibitors
    • Corrosion prevention by cathodic protection
    • Corrosion Control by anodic protection

    Content of UTC's corrosion training course

    1. Effects and Economic Impact of Corrosion
    2. Basic Important Concepts of Corrosion
    3. Eight Major Forms of Corrosion - general corrosion, stress corrosion cracking (SCC), crevice corrosion, pitting corrosion, galvanic corrosion intergranular corrosion, erosion corrosion and selective leaching
    4. Types of Corrosive Environments
    5. Principles of Aqueous Corrosion
    6. Atomsphere Corrosion
    7. Corrosion Characteristics of Structural Materials
    8. Corrosion Control by Proper Design
    9. Corrosion Control by Materials Selection
    10. Corrosion Control by Protective Coatings and Inhibitors
    11. Corrosion Control by Cathodic and Anodic Protection
    12. Corrosion Testing and Monitoring
    13. Failure Analysis on Corrosion

    To know more about UTC's corrosion course, clickCorrosion course information

    Objectives in corrosion engineering

      Corrosion engineering achieves corrosion control and corrosion prevention by failure analysis on corrded parts and research on corrosion behaviours & law:

    • Determine root cause(s) of corrosion.
    • Find out mechanism(s) of corrosion.
    • Recommend counter measures and solutions to prevent or minimize corrosion.
    • As corrosion expert witness, support litigation/court hearing on liabilities related to corrosion failures and accidents

    • Click here to understand more about effective failure analysis and accident investigation.

    Available analytical techniques for corrosion Investigtion

      According to the project requirements, following techniques are available for assessment and failure analysis on corrosion projects:

    • Scanning electron microscopy (SEM) to examine microscopic features of corrosion surfaces and pits.
    • Energy Dispersive X-Ray spectrometry (EDX) to study chemical aspects of corrosion.
    • Sectional metallography to examine material microstructure and relevance to corrosion.
    • Tensile / Compressive test
    • Charpy impact test
    • X-ray diffraction (XRD) to identify type of corrosion products.
    • X-ray photonelectron spectrometry (XPS) to chemical bonding of surface corrosion.
    • Fourier transform infrared spectrometry (FTIR)
    • Differential scanning calorimetry (DSC)
    • Thermaogravimetry analysis (TGA)
    • Ultrasonic Testing (UT)
    • Radiographic Testing (RT)
    • Liquid/dye Penetration Test (LT)

    Contact our corrosion experts for consultation of corrosion issues, please click EMAIL or Call (+65)81380509 for more details.

    corrosion failure analysis and acident investigation by UTC