The resistance of high chromium austenitic and ferritic stainless steels to corrosion by saturated sodium chloride brines was investigated. The effects of temperature, solution pH, and the addition of one percent of sodium hypochlorite on pitting and crevice corrosion were studied on test coupons containing welds. Increasing temperature and decreasing pH were observed to increase corrosion. Addition of sodium hypochlorite markedly increased the corrosivity of the brine. Alloys with highest molybdenum content such as the new ferritic alloys, 29-4 and 29-4-2 and the new austenitic alloy, AL-6X, offered best resistance to the brines. These alloys were followed, in order of decreasing resistance, by E-BRITE® (ASTM XM-27), Type 316, Type 444 (18-2), and Type 304 stainless steels. Further limited tests showed that the alloys most resistant to pitting and crevice corrosion were also highly resistant to stress corrosion cracking in the brine solutions. Selective corrosion on welds was not observed on any of the alloys investigated.

Subject
New alloys, Stainless alloys, Nickel based alloys, Molybdenum alloys, Sodium chloride, Acidity, Sodium chloride solution, Crevice corrosion, Brines, Pitting, Corrosion resistance, Stainless steel, Alloys
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1980
Association for Materials Protection and Performance (AMPP)
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