Abstract
To study the corrosion property of high strength type304 stainless steel for automotive applications in a chloride environment, cold rolled type304 stainless steel pipe with shot peening were used. The corrosion property of a sample, a pipe with a crevice between the outside and an O-ring and in which a press fitting part was inserted to create a tensile stress, was evaluated in an automotive field test in Okinawa. Cracking from a corrosion pit was observed in the crevice. It was thought that pitting corrosion was caused by chloride (from sea salt) concentrated in the crevice. The crack occurred in the residual compressive stress layer created by shot peening. A crack generated at a corrosion pit was reproduced in a wet/dry cyclic corrosion test after one flash of artificial seawater. To investigate the crack generating mechanism, a corrosion pit was generated on the sample by cyclic corrosion test, after which a cathodic charge test in artificial sea water was done. Similar cracking from a corrosion pit was observed on the sample after this test. Therefore, the cracking is presumed to be Hydrogen Embrittlement-Stress Corrosion Cracking (HE-SCC).
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