Passivation Tester
The Model 2026 passivation tester from Koslow Scientific (Englewood, NJ) measures the corrosion tendency of the surface of stainless steel. It detects surface free iron through a galvanic process that is measured as a voltage. There is no size limitation to the test piece. A test takes only one or two seconds. Electrical contact is made between a test piece through a moist pad. The Passi-Probe is pressed into the pad to complete the circuit and the cell voltage appears on the digital meter.
The measurement can be repeated over the surface of the test part at sensitive spots such as welds and seams. Values for passive and non-passive readings are included, and a standard 304 stainless steel coupon is provided for test comparison and instrument checkout. Samples reading non-passive can be passivated by running them through a passivation bath, and then re-tested. The tester can be used with chromium-containing stainless steels such as 300 and 400 series, and precipitation-hardened steels such as 17-4, 15-5, and 17-7.
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