| Description |
vi, 104 leaves : illustrations, photographs ; 29 cm |
| Summary |
"The preparation of casting slips containing ferrous powders dispersed by alginates was studied and an attempt was made to determine the mechanism by which suspension was attained. The colloidal aspects of preparing ceramic casting slips are discussed and an analogy is drawn to preparation of metallic slips suspended by alginates. Sodium and ammonium alginates were used to suspend stainless steel and iron powders. The effect of NaOH, HC1, and various phosphate additions on the properties of slips and algin solutions was considered. It was found that colloidal concepts can not be applied to explain observed behavior in the system studied. The behavior of the slips can be explained on the basis of normal corrosion reactions and the tendencies of alginates to form gels in the presence of heavy metal ions, rather than on the basis of defloccollating a polydispersed colloidal system. Slips prepared with sodium and ammonium alginates differ in their behavior. This is explained on the basis of the characteristic pH's of the alginates, their behavior in the presence of hydroxyl ions, and the effect on corrosion of the solubility of ferrous hydroxide"--Abstract, leaf ii. |
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