| 摘要 |
PURPOSE:To obtain a steel plate suitable for automatic sensing excellent in the surface conductivity at the uncoated part thereof and in the insulating property at the paining part thereof, by processing the steel plate with due regard to the average roughness and max. height of the surface of the steel plate and the base material configuration. CONSTITUTION:Temper rolling is performed under a predetermined condition by two stand rolling machines to prepare a steel plate having a matte-finish surface of an average roughness, highest, and base material configuration A after the rolling, this steel plate is degreased and pickled and is chrome plated with, for example, metallic chromium of 20-200mg/m<2> and chromium of 5-50mg/m<2> per one side of the surface, chromium oxide with equivalent amount of metallic. Then, coating ins performed as shown by drawing (a) according to a predetermined coating condition. Subsequently, a pair of contact elements 3 are contacted with the steel plate 4 having coated parts 1 and uncoated parts 2 and the electrical energization and insulating property thereof are evaluated. The adhesion test of the coated film is performed, for example, by a method wherein the contact elements 3 shown by drawing (b) are pressed against the coated surface using a load body 5 of 100g to perform scanning, and evaluation is performed.
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