Identification of factors affecting the aqueous corrosion properties of (Ti, Al) N-coated steel

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

    Research output: Contribution to journalArticleScientificpeer-review

    36 Citations (Scopus)

    Abstract

    Carbides, borides and nitrides of transition metals are increasingly used as coating materials because of their high hardnesses and excellent wear resistances. 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 physical vapour deposition (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 (Ti, Al) N coatings on type ASP 23 high speed steel was studied. The factors evaluated were the thickness of the coating, the thickness and the type of the intermediate layer, the titanium-to-aluminium ratio 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 sulphuric acid solution at ambient temperature. In these conditions, corrosion of a coated steel part occurs mainly in the base material. The 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
    Pages (from-to)353 - 358
    Number of pages6
    JournalSurface and Coatings Technology
    Volume49
    Issue number1-3
    DOIs
    Publication statusPublished - 1991
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Steel
    corrosion
    steels
    Corrosion
    coatings
    Coatings
    corrosion resistance
    Corrosion resistance
    Physical vapor deposition
    vapor deposition
    inhomogeneity
    Boron Compounds
    Porosity
    porosity
    Caustics
    borides
    Borides
    Corrosion protection
    pinholes
    Titanium

    Cite this

    Aromaa, Jari ; Ronkainen, Helena ; Mahiout, Amar ; Hannula, Simo-Pekka. / Identification of factors affecting the aqueous corrosion properties of (Ti, Al) N-coated steel. In: Surface and Coatings Technology. 1991 ; Vol. 49, No. 1-3. pp. 353 - 358.
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    abstract = "Carbides, borides and nitrides of transition metals are increasingly used as coating materials because of their high hardnesses and excellent wear resistances. 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 physical vapour deposition (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 (Ti, Al) N coatings on type ASP 23 high speed steel was studied. The factors evaluated were the thickness of the coating, the thickness and the type of the intermediate layer, the titanium-to-aluminium ratio 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 sulphuric acid solution at ambient temperature. In these conditions, corrosion of a coated steel part occurs mainly in the base material. The 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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    Identification of factors affecting the aqueous corrosion properties of (Ti, Al) N-coated steel. / Aromaa, Jari; Ronkainen, Helena; Mahiout, Amar; Hannula, Simo-Pekka.

    In: Surface and Coatings Technology, Vol. 49, No. 1-3, 1991, p. 353 - 358.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Aromaa, Jari

    AU - Ronkainen, Helena

    AU - Mahiout, Amar

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    N2 - Carbides, borides and nitrides of transition metals are increasingly used as coating materials because of their high hardnesses and excellent wear resistances. 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 physical vapour deposition (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 (Ti, Al) N coatings on type ASP 23 high speed steel was studied. The factors evaluated were the thickness of the coating, the thickness and the type of the intermediate layer, the titanium-to-aluminium ratio 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 sulphuric acid solution at ambient temperature. In these conditions, corrosion of a coated steel part occurs mainly in the base material. The 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 hardnesses and excellent wear resistances. 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 physical vapour deposition (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 (Ti, Al) N coatings on type ASP 23 high speed steel was studied. The factors evaluated were the thickness of the coating, the thickness and the type of the intermediate layer, the titanium-to-aluminium ratio 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 sulphuric acid solution at ambient temperature. In these conditions, corrosion of a coated steel part occurs mainly in the base material. The 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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