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Current Issue
1986 Vol.3 Issue.4,
Published 1986-10-15
Article
Article
1
Preliminary Investigation on Improvement of Liquid Diffusion Diaphragm Cell
Zhang Jian-Hou
In order to improve the traditional Sintered-glass diaphragm cell used for liquid diffusion, preliminary investigation has been made on the applicability of porous metallic membrane. It has been found that a metallic membrane with openings of average radius of 1.42μ and thickness of 100μ can be successfully used for such purpose. The diffusion coefficients determined by the metallic diaphragm cell for the water-ethanol and ethanol-carbon tetrachloride systems at 25.00℃ are in agreement with those published in literature. The time of determination has been reduced from 2～4 days as usually required for sinter-glass diaphragm cell to 1.5～4 hrs. for the present cell. Diffusion coefficients have also determined at 25.00℃ by the present cell for benzene-carbon tetrachloride and propanol-carbon tetrachloride systems with experimental error less than 1.8%
1986 Vol. 3 (4): 1-10 [
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11
Study on Corrosion Resistance of Amorphous Fe-Cr-P-C Alloy
Sun Zhong-Zi
Thin ribbons of amorphous Fe_(75)Cr_5P_(13)C_7 alloy were prepared by single-roll rapid-quenching method. The composition, structure and mechanical property of the samples were analysed. Corrosion behaviour of the alloy in 1N H_2SO_4, 1N H_2SO_4+0.5N NaCl, 1N HCl and 10% FeCl_3·6H_2O solutions was investigated by means of the method of complete immersion and the curves experimentally determined of potentiodynamic polarization and of potentiostatic current density vs. time. The results indicate that the property of the amorphous alloy prepared by the simple method mentioned is stable. It is exceedingly corrosion-resistant in acid mediums. Its corrosion behaviour was not significantly affected and it did not suffer pitting when the medium contained Cl~- ions, The high resistance to corrosion of the amorphous alloy might be the result of that there are no crystalline defects such as grain boundaries, dislocation faults, segregation etc, in it, and that it has extremely high reactiyity with rapid formation of passive film.
1986 Vol. 3 (4): 11-16 [
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1664
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16
1986 Vol. 3 (4): 16-16 [
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1483
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9
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17
1986 Vol. 3 (4): 17-21 [
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1476
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7
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22
1986 Vol. 3 (4): 22-26 [
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1595
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7
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27
1986 Vol. 3 (4): 27-38 [
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1437
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8
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39
1986 Vol. 3 (4): 39-48 [
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1522
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8
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48
1986 Vol. 3 (4): 48-48 [
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1377
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8
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49
1986 Vol. 3 (4): 49-53 [
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1820
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8
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54
1986 Vol. 3 (4): 54-57 [
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1468
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8
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58
1986 Vol. 3 (4): 58-61 [
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1444
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8
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62
1986 Vol. 3 (4): 62-70 [
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1462
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7
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70
1986 Vol. 3 (4): 70-70 [
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1339
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71
1986 Vol. 3 (4): 71-73 [
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1458
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7
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74
1986 Vol. 3 (4): 74-79 [
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1615
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8
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