| 摘要 |
PURPOSE:To acculately evaluate the corrosion resistance of a coated metal, by supplying a substance for testing corrosion resistance to the coated side of the metal having coating or lining applied to the surface thereof and discharging H2 penetrated into and dissolved in the metal from the surface of the metal under a coating film by evacuating the back side thereof to measure the amount of H2. CONSTITUTION:The side of the uncoated surface 5 of the opposite side of a metal material 1 having coating or lining 2 applied to one surface thereof is held under high vacuum by a vacuum pump 9 are gas containing a corrosive liquid or gas such as brine, H2S- or Cl2-gas or the like is supplied to the surface to which lining or the like is applied and H2 is generated between the metal 1 and the coating 2 at a predetermined temp. and allowed to the penetrated and dissolved in the metal. This generated H2 is discharged to the side of the surface 5 at every definite time and the amount thereof is measured by a highly sensitive mass analyzer 11 capable of detecting an extremely minute amount of H. By this method, even with respect to a metal excellent in corrosion resistance, the corrosion oresistance of the coated metal can be evaluated simply and accurately. |
