EXPOSURE TEST STATION SIMULATED MARINE ENVIRONMENT AT KAWASAKI PLANT

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Exposure Test Station Simulated Marine Environment At Kawasaki Plant

Test plant-based data collection

Basic data is collected at a test plant that simulates an ocean environment. Evaluation including the weld points needed to create the actual structure is ongoing.

Seawater exposure test area

Test piece (stainless steel pipe pile cover)

Splash zone

Tidal zone

Submerged zone

After one year of exposure	NAS 254N	NAS 185N	SUS 316L
State with marine organisms stuck to the pile
After removal of the marine organisms	No crevice corrosion	No crevice corrosion	Crevice corrosion occurred

After one year of exposure	State with marine organisms stuck to the pile	After removal of the marine organisms
NAS 254N		No crevice corrosion
NAS 185N		No crevice corrosion
SUS 316L		Crevice corrosion occurred

Surface of weld points on various stainless steel pipe piles. Super stainless steel has excellent resistance to seawater, with no crevice corrosion forming even where barnacles have adhered to the surface, including at weld points.

Other tests

To investigate corrosion resistance of various types of steel under actual conditions, we also conduct exposure tests on small pieces inside the seawater exposure test area.