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PERFORMANCE OF VARIOUS COATINGS ON STEEL STRUCTURES IN MARINE ATMOSPHERE

This study is intended to obtain basic data which will become a guide in taking anti-rust steps on exposed area of marine construction for ocean development and steel structures for offshore installations. Various painting systems were coated on KTA test panels and tested for outdoor exposure from the autumn of 1970. The results of exposure test carried out for the last six years are summarized as follows. 1) Investigation of Appearance: The painting systems tested did not show any rust except on channel and welded part of the tested specimen. In general, a good anti-corrosive performance was obtained but spotted rust was noted around welded part and also around the channel coated with oil alkyd and chlorinated rubber painting system. Checking and blistering that had occurred three years ago did not make almost no progress up to present time. No defect had occurred in the film of zinc spray based painting system nor of epoxy painting system, not even around welded area and the channel of the tested pannel. 2) Adhesion Test: The result of adhesion test of the coating after six years exposure was just as good as that of three years. Chlorinated rubber paints had displayed the best adhesion test of the coating after six years exposure was just as good as that of three years. Chlorinated rubber paints had displayed the best adhesion result. The adhesion of epoxy paint was considered a failure due to long interval between each painting. According to the test, oil paints had deteriorated in adhesion, accompanied by embrittlement in the painted film. 3) Impedance Measurement: Impedance was measured with representative painting systems, such as oil paints, chlorinated rubber paints and epoxy paints and with an exception of red lead oil painting system, the tested film of all paints had maintained a good performance. 4) Cl to the minus power Deposit Measurement: Water soluble Cl to the minus power deposit on CR Paint Finish and MICAS-A was in the range of 0.014--1.2 mg/d sq m.

  • Corporate Authors:

    Mitsui Shipbuilding and Engineering Company, Ltd

    6-4 Tsukiji, 5-chome, Chuo-ku
    Tokyo,   Japan 
  • Authors:
    • Shimatani, S
    • MORITA, T
  • Publication Date: 1977

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00167754
  • Record Type: Publication
  • Source Agency: Mitsui Technical Review
  • Report/Paper Numbers: No. 99
  • Files: TRIS
  • Created Date: Jan 13 1978 12:00AM