MODEL BOILER STUDIES ON DEPOSITION AND CORROSION.

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作者：

Balakrishnan, P.V.

McVey, E.G.

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来源：

Atomic Energy of Canada Limited, AECL (Report) | 1977年 / 5801期

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摘要：

Deposit formation was studied in a model boiler, with sea-water injections to simulate the in-leakage which could occur from sea-water cooled condensers. When All Volatile Treatment (AVT) was used for chemistry control, the deposits consisted of the sea-water salts and corrosion products. With sodium phosphate added to the boiler water, the deposits also contained the phosphates derived from the sea-water salts. Energy dispersive X-ray analysis and scanning electron microscopy showed that the deposits were formed in layers of differing compositions. There was no significant corrosion of the Fe-Ni-Cr alloy boiler tube under deposits, either on the open area of the tube or in crevices. However, carbon steel that formed a crevice around the tube was corroded severely when the boiler water did not contain phosphate. The observed corrosion of carbon steel was caused by the presence of acidic, highly concentrated chloride solution produced from the sea-water within the crevice. Results of theoretical calculations of the composition of the concentrated solution are presented.

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