To provide a simple method for determining chemical conversion treatability of steel, and a method for producing steel excellent in chemical conversion treatability utilizing the same.
Target steel is immersed in a chemical solution (chemical conversion treatment solution), and the immersing potential of the steel is continuously measured from the start of immersion to measure the time required for the immersing potential of the steel to be the same as the natural immersing potential in the chemical solution. The obtained time is compared with the appropriate treatment time determined for performing the chemical conversion treatment of steel using a chemical solution (chemical conversion treatment solution) to be used, and when the obtained time is 2/3 or less of the appropriate treatment time, the steel is determined to be steel excellent in chemical conversion treatability. Further, when the method for determining the chemical conversion treatability of steel is used to determine the chemical conversion treatability of target steel, and the steel is determined to be steel poor in chemical conversion treatability, improvement treatment of the chemical conversion treatability is performed to form steel excellent in chemical conversion treatability. A preferred improvement treatment of chemical conversion treatability includes the treatment of applying cold rolling, a shot blast, pickling, polishing/grinding, and the like.
ARAYA MASATOSHI
SATO AKIO
Suzuki Yoko
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