Factors affecting the corrosion resistance of PVD thin films

Jari Aromaa, Helena Ronkainen, Kari Saarinen, Amar Mahiout, Simo-Pekka Hannula

    Research output: Book/ReportReport

    Abstract

    Carbides, borides and nitrides of transition metals are increasingly used as coating materials because of their high hardness and excellent wear resistance. However, these coatings can also potentially be used in applications requiring corrosion resistance because of their inherent stability under a variety of aqueous conditions. Thin film coatings based on these materials are generally produced by PVD methods. Such coatings often exhibit porosity which usually is thought to result from pinholes formed during deposition. If local defects form a direct path between the corrosive environment and the base material the corrosion protection is lost. In this work the influence of different factors on the corrosion resistance of PVD coatings was studied. The factors evaluated were the thickness of the coating, the thickness and the type of the intermediate layer, the composition of the coating and the number of heterogeneities in the coating. Electrochemical porosity measurements which are essential for the estimation of the corrosion resistance of coated components were made in 1 N sulfuric acid solution at ambient temperature. In these conditions corrosion of a coated steel part occurs mainly in the base material. Corrosion resistance was also evaluated with immersion tests. The results of this work suggest the dominating role of the inhomogeneities on the corrosion resistance of the PVD (Ti,Al)N and TiN coatings. Preliminary analysis of the nature of the inhomogeneities is made and their possible source is discussed.
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages60
    ISBN (Print)951-38-4653-9
    Publication statusPublished - 1995
    MoE publication typeNot Eligible

    Publication series

    SeriesVTT Publications
    Number215
    ISSN1235-0621

    Fingerprint

    Physical vapor deposition
    Corrosion resistance
    Thin films
    Coatings
    Porosity
    Borides
    Corrosion protection
    Sulfuric acid
    Nitrides
    Wear resistance
    Transition metals
    Carbides
    Hardness
    Corrosion
    Defects
    Steel
    Chemical analysis

    Keywords

    • surface coatings
    • borides
    • carbides
    • nitrides
    • corrosion resistance
    • porosity
    • thin films
    • titanium nitrides
    • titanium borides
    • titanium carbides

    Cite this

    Aromaa, J., Ronkainen, H., Saarinen, K., Mahiout, A., & Hannula, S-P. (1995). Factors affecting the corrosion resistance of PVD thin films. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 215
    Aromaa, Jari ; Ronkainen, Helena ; Saarinen, Kari ; Mahiout, Amar ; Hannula, Simo-Pekka. / Factors affecting the corrosion resistance of PVD thin films. Espoo : VTT Technical Research Centre of Finland, 1995. 60 p. (VTT Publications; No. 215).
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    abstract = "Carbides, borides and nitrides of transition metals are increasingly used as coating materials because of their high hardness and excellent wear resistance. However, these coatings can also potentially be used in applications requiring corrosion resistance because of their inherent stability under a variety of aqueous conditions. Thin film coatings based on these materials are generally produced by PVD methods. Such coatings often exhibit porosity which usually is thought to result from pinholes formed during deposition. If local defects form a direct path between the corrosive environment and the base material the corrosion protection is lost. In this work the influence of different factors on the corrosion resistance of PVD coatings was studied. The factors evaluated were the thickness of the coating, the thickness and the type of the intermediate layer, the composition of the coating and the number of heterogeneities in the coating. Electrochemical porosity measurements which are essential for the estimation of the corrosion resistance of coated components were made in 1 N sulfuric acid solution at ambient temperature. In these conditions corrosion of a coated steel part occurs mainly in the base material. Corrosion resistance was also evaluated with immersion tests. The results of this work suggest the dominating role of the inhomogeneities on the corrosion resistance of the PVD (Ti,Al)N and TiN coatings. Preliminary analysis of the nature of the inhomogeneities is made and their possible source is discussed.",
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    note = "Project code: MRG0012",
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    Aromaa, J, Ronkainen, H, Saarinen, K, Mahiout, A & Hannula, S-P 1995, Factors affecting the corrosion resistance of PVD thin films. VTT Publications, no. 215, VTT Technical Research Centre of Finland, Espoo.

    Factors affecting the corrosion resistance of PVD thin films. / Aromaa, Jari; Ronkainen, Helena; Saarinen, Kari; Mahiout, Amar; Hannula, Simo-Pekka.

    Espoo : VTT Technical Research Centre of Finland, 1995. 60 p. (VTT Publications; No. 215).

    Research output: Book/ReportReport

    TY - BOOK

    T1 - Factors affecting the corrosion resistance of PVD thin films

    AU - Aromaa, Jari

    AU - Ronkainen, Helena

    AU - Saarinen, Kari

    AU - Mahiout, Amar

    AU - Hannula, Simo-Pekka

    N1 - Project code: MRG0012

    PY - 1995

    Y1 - 1995

    N2 - Carbides, borides and nitrides of transition metals are increasingly used as coating materials because of their high hardness and excellent wear resistance. However, these coatings can also potentially be used in applications requiring corrosion resistance because of their inherent stability under a variety of aqueous conditions. Thin film coatings based on these materials are generally produced by PVD methods. Such coatings often exhibit porosity which usually is thought to result from pinholes formed during deposition. If local defects form a direct path between the corrosive environment and the base material the corrosion protection is lost. In this work the influence of different factors on the corrosion resistance of PVD coatings was studied. The factors evaluated were the thickness of the coating, the thickness and the type of the intermediate layer, the composition of the coating and the number of heterogeneities in the coating. Electrochemical porosity measurements which are essential for the estimation of the corrosion resistance of coated components were made in 1 N sulfuric acid solution at ambient temperature. In these conditions corrosion of a coated steel part occurs mainly in the base material. Corrosion resistance was also evaluated with immersion tests. The results of this work suggest the dominating role of the inhomogeneities on the corrosion resistance of the PVD (Ti,Al)N and TiN coatings. Preliminary analysis of the nature of the inhomogeneities is made and their possible source is discussed.

    AB - Carbides, borides and nitrides of transition metals are increasingly used as coating materials because of their high hardness and excellent wear resistance. However, these coatings can also potentially be used in applications requiring corrosion resistance because of their inherent stability under a variety of aqueous conditions. Thin film coatings based on these materials are generally produced by PVD methods. Such coatings often exhibit porosity which usually is thought to result from pinholes formed during deposition. If local defects form a direct path between the corrosive environment and the base material the corrosion protection is lost. In this work the influence of different factors on the corrosion resistance of PVD coatings was studied. The factors evaluated were the thickness of the coating, the thickness and the type of the intermediate layer, the composition of the coating and the number of heterogeneities in the coating. Electrochemical porosity measurements which are essential for the estimation of the corrosion resistance of coated components were made in 1 N sulfuric acid solution at ambient temperature. In these conditions corrosion of a coated steel part occurs mainly in the base material. Corrosion resistance was also evaluated with immersion tests. The results of this work suggest the dominating role of the inhomogeneities on the corrosion resistance of the PVD (Ti,Al)N and TiN coatings. Preliminary analysis of the nature of the inhomogeneities is made and their possible source is discussed.

    KW - surface coatings

    KW - borides

    KW - carbides

    KW - nitrides

    KW - corrosion resistance

    KW - porosity

    KW - thin films

    KW - titanium nitrides

    KW - titanium borides

    KW - titanium carbides

    M3 - Report

    SN - 951-38-4653-9

    T3 - VTT Publications

    BT - Factors affecting the corrosion resistance of PVD thin films

    PB - VTT Technical Research Centre of Finland

    CY - Espoo

    ER -

    Aromaa J, Ronkainen H, Saarinen K, Mahiout A, Hannula S-P. Factors affecting the corrosion resistance of PVD thin films. Espoo: VTT Technical Research Centre of Finland, 1995. 60 p. (VTT Publications; No. 215).