With Deformation and with or without Heat treatment. Studied the resistance of the corrosion of Stainless Steel; with deformed and before or after the deformation annealed at 675°C in one hour, by dilute acid and solt Solutions as fallowes: 1% HCl, 1% H₂SO₃, 1% HNO, 1% CH₈COOH, 1% NH₄ OH, 1% NH₄CL, 2 or 3% NaCL, & 1 or 5% NaOH.
The investigation is observed wite three kinds of specimens and under the constant conditions, namely They are (A) Specimens without heat treatment before and after its deformation, (B) Specimens with heat treatment after its deformation, (C) Specimens with heat treatment before its deformation: and these are at the room temperature free from tne Sun chinee and at the still state with no agitation.
From the authors experiments derived such conclusions in general as;
(1) Clearing the effects of the heat treatment upon the resistance of corrosion.
(2) The resistance of corrosion will be mostly improved by the proper heat treatment after the deformation, next before it, and it is observed least resistance when with no heat heatment.
(3) The parts with free flows of Crystalline grains by deformations will be most corroded, in other words heterogeneous arrongement of crystalline grains will vigorous corroded.
(4) Stainless steel with higher chrmium hos little resistance for the corrosion in a solu tion with chlorine ion.
(5) The film of passivity which grows in the solution minimire the corrosion.
Many thanks to Emeritus Proffessor Dr. Tawara and Assistant Professor Tanaka of Tokyo Impe rial University.

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