THE ETCHING SOLUTION AND THE METHOD OF USING IT FOR OBSERVING METALLOGRAPHY OF THE LOWEST CARBON STEEL

摘要

The present invention relates to an etching solution for the observation of ultra-low carbon steel used as an exterior plate of an automobile, and an etching method using the same, to prepare an etching solution by adjusting the component system, and to etch the ultra-low carbon steel by etching it under appropriate conditions. An object of the present invention is to provide an etching solution for tissue observation of an ultra low carbon steel and an etching method using the same, which are excellent in tissue reproducibility of the ultra low carbon steel and can easily observe the structure of the ultra low carbon steel.;The present invention for achieving the above object is sodium thiosulfate (Na ₂ S ₂ O ₅ ): 1.0-1.5 g / L, hydrochloric acid: 10-30 cc / L, sodium dodecyl benzene sulfonate (C ₁₂ H ₂₆ C ₈ H ₄ SO ₂ Na): 10-30cc / l and the remainder: It is about the etching solution for the structure observation of the ultra low carbon steel which consists of water, and the etching method of the ultra low carbon steel using the same.