液体アンモニア中における応力腐食割れ促進試験法の開発

概要

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To develop a laboratory test method for accelerating stress corrosion cracking (SCC) of steels in liquid ammonia, effects of ammonia contaminants, such as O_2, N_2, CO_2, etc., and electro-chemical polarization on the time to failure of specimen under a constant tensile load have been studied. SCC is strongly accelerated by an anodic polarization of steel in liquid ammonia which is saturated with CO_2 and contaminated with O_2 above 0.5 atm partial pressure. By this test method, previous research findings on the inhibition of SCC by the addition of water and the decrease of temperature are confirmed. The susceptibility for SCC of various commercial steels examined by this method for 7 days is correlated very well with the result of one year immersion test in ammonia storage tank. Cracks of specimens are quite similar in appearance and this suggests the same SCC mechanism prevails in both cases.
社団法人日本鉄鋼協会の論文
1981-10-01