抄録
Although iron shows the most conspicuous example of metal liable to become passivized, inasmuch as it being bad metal, it is generally corroded. However, it becomes corrosion-proof owing to a stable film produced when it is passivized. So, it is acommon practice to apply such a method of alkali coloring, parkerizing or bonderizing. But, in this experiment, a research was made into a corrosion-proof nature and rust-preventive power due to treatment and work, after a coloring measurement has been made by means of potassium ferro cyanide on divalent ferro iron which is dissolved in dipping solution, in an aim of making a deriveration on the treatment and work so as to maintain the grinding brilliance and corrosion-proof nature.
