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1993 Fiscal Year Final Research Report Summary

Evaluation Methods for Degradation and Adhesiveness of Coatings using Microscopic Photo-acoustic (MPA) Method

Research Project

Project/Area Number 04555169
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 金属材料(含表面処理・腐食防食)
Research InstitutionTokyo Institute of Technology

Principal Investigator

TSURU Tooru  Tokyo Institute of Technology, Faculty of Engineering Professor, 工学部, 教授 (20092562)

Co-Investigator(Kenkyū-buntansha) NODA Kazuhiko  Hokkaido University Faculty of Engineering Research Associate, 工学部, 助手 (60241361)
MASAMURA Katsumi  Nippon Kokan Co.Ltd.Iron and Steel R.& D.Inst.Researcher, 鉄鋼研究所, 主任研究員
MIYOSHI Yasuhiko  Nippon Steel Co.Ltd.Iron and Steel R.& D.Inst.Researcher, 鉄鋼研究所, 主幹研究員
NISHIKATA Atsushi  Tokyo Institute of Technology Faculty of Engineering Associate Professor, 工学部, 助教授 (90180588)
Project Period (FY) 1992 – 1993
KeywordsPhoto acoustic microscopy / PAS / TiN / Coating / Coating films / Degradation / Delamination / AC impedance
Research Abstract

New evaluation technique for degradation and adhesiveness of coatings on steels have been developed based on photo acoustic method and AC impedance method. Chopped infrared laser light or visible Ar laser light was led into a microscope focusing on a sample, then photo-acoustic signal was detected by piezo polymer sensor on the other side of the sample. The new instrument, based on microscopic photo-acoustic (MPA) method, indicates a map which denotes degraded area or less adhesive area of coatings.
Using MPA method, degradation of organic and TiN ceramics coatings on a mild steel and a stainless steel were clearly detected in a 5 to 10 mum spatial resolution. It is found that for the organic coatings the sensitivity of MPA signal depends upon the corrosivity of the substrate. On the other hand, under film corrosion is detected for the ceramics coated steels. Wave length of the laser light has an influence on the detection of the corrosion products and under film corrosion. This effect is interpreted by the difference in the absorbency and reflectivity of the laser light for coatings and corrosion products.
AC impedance analysis on coated steels with an artificial defects indicated that the current distribution has to be considered especially for narrow gap delamination of coatings. For very narrow gap between the coating film and the substrate, the electrical equivalent circuit is simulated by a transmission line model. Experimental results from impedance method are simulated by curve fitting method, and the area of the degradation is estimated from the values of cuircuite elements by fitting.

  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] 八木和人,片山英樹,西方篤,水流徹: "塗装ステンレス鋼板のインピーダンス特性(I)-伝送線回路モデルによる解析-" 日本金属学会秋季大会講演概要集. 435 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 片山英樹,八木和人,西方篤,水流徹: "塗装ステンレス鋼板のインピーダンス特性(II)-塗膜劣化評価への適用-" 日本金属学会秋季大会講演概要集. 436 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 片山英樹,西方篤,水流徹: "塗装ステンレス鋼板劣化の評価とその機構" 腐食防食'93講演集. 207 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 水流徹: "腐食研究の課題と新しい測定法" 表面技術. 44. 654 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 水流徹: "光音響法の腐食測定への応用" 材料と環境. 42. 728 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 水流徹,原口智: "TiN被覆ステンレス鋼の欠陥拡大の顕微光音響法による評価" (日本鉄鋼協会春季大会発表予定,1994.4).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tooru Tsuru: "Photoacoustic Method for Corrosion Measurement" Corrosion Engineering. 42. 901 (1993)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-03-27  

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