Corrosion of nickel, chromium, and nickel-chromium steels: J. N. FRIEND, .J. L. Bentley, and Walter West. (Engineering, xciii, 753.)
- Publisher
- Elsevier Science
- Year
- 1914
- Tongue
- English
- Weight
- 69 KB
- Volume
- 177
- Category
- Article
- ISSN
- 0016-0032
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✦ Synopsis
xciii, 753.)--Disks were prepared of carbon steels, to serve as standards, of nickel steels, of chromium steels, and of nickel-chromium steels, each 0.7 cm. thick and 2'.8 cm. in diameter. These disks were kept nearly immersed in tap-water for 64 days, in sea-water for 60 days, in 0. 5 per cent. sulphuric acid for 60 days, in 0. 5 per cent. sulphuric acid for 53 days, and they were exposed to alternate wet and dry tests for 52 days. The acceleration tests in 0. 5 per cent. sulphuric acid gave misleading results, and the two standard steels, which showed practically equal corrosion in all the other tests, showed IOO per cent. deviation with o. 5 per cent. sulphuric acid, and with the other steels there were remarkable differences. In some cases there were indications of galvanic action in the chromium and nickel steels in the acid tests, and no chromium nor nickel passed into solution, showing that these elements were the constituents of the cathode. The resistance of chromium steels to corrosion in salt water suggests the use of this metal for ship-building. Nickel steels show marked resistance both to acid and neutral corrosive solutions, the resistance increasing with increased nickel content.