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Analyses of Corrosion of Metallic Materials and Steel Materials

For corrosion analysis and corrosion prevention design of metallic materials and steel materials, it is important to analyze corrosion products and then observe and analyze the state of the intercrystalline interface. JFE-TEC provides techniques necessary for such observation and analysis.

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Analyses of Corrosion Product

JFE-TEC analyzes the cause of corrosion by observing the corrosion product, check for stress corrosion cracking (SCC), morphological observation of coating/resin deterioration condition, element analysis, chemical state analysis, and identification of the crystalline phase.

  • Morphological observation

    • Observation of corrosion product at the end of stress corrosion cracking using ULV-SEM
    • Observation of corrosion product in surface-treated steel sheet/painted sheet using ULV-SEM
    • Observation of fine corrosion after corrosion by gas using ULV-SEM
    • Observation of stainless steel passive film using Cs corrector STEM
    • Coherent precipitation of metallic compound in Ni-based alloy

  • Elementary analysis

    • Element mapping of corrosion product in low alloy steel using EPMA
    • Analysis of stainless steel passive film using Cs corrector STEM-EDX/EELS
    • Analysis of concentration element in corrosion product using Cs corrector STEM
    • Analysis of concentration element in corrosion product using ULV-SEM-EDX
    • Analysis in depth direction of corroded layer using surface treatment (AES, XPS)
    • Analysis in depth direction of fine corroded portion after corrosion by gas using AES
    • Investigation of Au plating pore corrosion using SEM and AES

  • Chemical state analysis

    • Identification of chemical species of corrosion product using Raman spectroscopy
    • Identification of compound state of fine corrosive after corrosion by gas using XPS
    • Observation of fine corrosion after corrosion by gas using XPS

  • Crystalline structure analysis

    • Identification of chemical species of corrosion product/quantitative analysis of iron rust
    • Analysis of corrosion product in body of actually driven vehicle in North America using X-ray diffraction method

State Analysis of Intercrystalline Interface, Intercrystalline Segregation/Concentration, and Intercrystalline Interface-depleted Layer

JFE-TEC analyzes the state of the intercrystalline interface that may cause corrosion and high resistance to corrosion, as well as intercrystalline segregation, concentration, intercrystalline interface-depleted layer, and other factors.

  • Morphological observation

    • Metal structure observation (micro/macro observation)
    • Observation of intercrystalline interface using Cs corrector STEM, TEM and SEM
    • Analysis of intercrystalline interface precipitate using SEM and TEM

  • Element analysis

    • Concentration distribution of chrome (Cr)-depleted layer in sensitized stainless steel
    • Mapping analysis of boron intercrystalline segregation in steel material using SIMS
    • Analysis of stainless steel passive film using Cs corrector STEM-EDX/EELS
    • Analysis of intercrystalline segregation/concentration element using Cs corrector STEM-EDX/EELS

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