The Iron and steel magazine . end to show that from 12 percent nickel upwards the tendency to corrode under these condi-tions diminishes. Sea-Water Corrosion Tests. — These were carried out underconditions similar to those described for the fresh-water corro-sion tests. The duration of the test was thirty-three days, andthe sea water was changed once a week. The losses in weightvaried from .11 to .22 of a gram. The percentage losses are I IO The Iron and Steel Magazine about twice as great as in the case of the fresh-water tests, andthey agree with the latter in indicating that up to .12 per c
The Iron and steel magazine . end to show that from 12 percent nickel upwards the tendency to corrode under these condi-tions diminishes. Sea-Water Corrosion Tests. — These were carried out underconditions similar to those described for the fresh-water corro-sion tests. The duration of the test was thirty-three days, andthe sea water was changed once a week. The losses in weightvaried from .11 to .22 of a gram. The percentage losses are I IO The Iron and Steel Magazine about twice as great as in the case of the fresh-water tests, andthey agree with the latter in indicating that up to .12 per centnickel no marked difference of behavior is exhibited by thealloys, and that with higher percentages of nickel the tendencyto corrode is less marked. Acid Corrosion Tests.—The bars used in the previous experi-ments were afterwards immersed, each in a separate trough,and supported at two points on thin glass rods, to enable theliquid to circulate round the bar in acid —? at the ordinary tem- Fig. 7 .— zoZ Nickel £er cent. peratures — made by mixing equal volumes of distilled waterand concentrated sulphuric acid. More than sufficient acid waspresent to dissolve the whole of each bar. A vigorous actionsoon set in with the early members of the series, the gas evolutionbeing less marked among the later members. As time went on,bars A-H gradually became coated with a deposit of white was probably a mixture of anhydrous sulphates, insolublein sulphuric acid. After a fortnight the powders were brokenoff, and the liquids well stirred. After seventeen days the re-action had practically ceased among the early members. Thebars were then taken out, washed, dried at 1200 C. (2480 F.), Iron Nickel-Manganese Carbon Alloy, i i i cooled in a desiccator and weighed. The losses in weighl rangedfrom about .21 to .88 grams. The percentage losses vary be-tween (B) and .28 (J and EC). Except for a rather high corrosion figure for B, the valuesdecrease fairly
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Keywords: ., bookcentury1800, bookdecade1890, bookidironsteel, booksubjectiron
