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三,狭义磷酸盐涂层的研究 续 (三)关于酸性磷酸盐的基本实验 对于通过磷酸二氢盐水溶液获取偏磷酸盐的目的,制取相应的磷酸二氢盐水溶液是首要条件。磷酸二氢盐虽然通常易溶于水,但对于涂层的具体目的,某些盐的溶解度仍然并不理想。例如通常重要的钙盐就仅只是稍溶于水的程度。实践证明,对于通过水溶液获取涂层的目的,涂液的溶质总浓度保持在35%左右通常是必要的。一个浓度过低的涂复液,将因为形成的涂层过薄或过稀而实际上无法使用。作为提高磷酸二氢盐在水中溶解度的办法,通常是添加游离磷酸以避免
Third, the narrow sense of the phosphate coating continued (c) of the basic experiments on acid phosphate For the purpose of obtaining partial phosphate by dihydrogen phosphate solution, the preparation of the corresponding dihydrogen phosphate solution is the first condition. Although dihydrogenphosphate is generally readily water soluble, the solubility of certain salts is still not ideal for the particular purpose of the coating. For example, usually important calcium salts are only slightly soluble in water. Practice has proved that for the purpose of obtaining a coating through an aqueous solution, the total solute concentration of the coating liquid is maintained at about 35% is usually necessary. A coating solution that is too low in concentration will be virtually unusable because the resulting coating is too thin or too thin. As a means of increasing the solubility of dihydrogen phosphate in water, it is common to add free phosphoric acid to avoid