tailieunhanh - Failure Analysis Case Studies II Episode 10

Tham khảo tài liệu 'failure analysis case studies ii episode 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 303 Fig. 2. Crevice corrosion suffered by the 3I6L stainless steel pump. Small crystals of sodium chloride can be seen on and around the corroded area. corresponding volumes would be and 1 respectively. There is a slight - increase in volume on mixing. Data for the solubility of sodium chloride in water-butanone mixtures could not be found. However there are data for the solubility of sodium chloride in water-acetone mixtures at 20 c 3 . These are given in Table 2. The lower and upper layers in Table 2 refer to the water- and acetone-rich solutions respectively. Comparison of the data in Table 2 and the water-butanone phase diagram shown in Fig. 1 shows that the solubility of acetone in water is roughly comparable to that of butanone in water and that water is more soluble in acetone than in butanone. Thus the solubility of sodium chloride in water-acetone mixtures should only be considered as a guide to what might happen in water-butanone mixtures. Although the lower and upper layers in the immiscible water-acetone mixtures are in equilibrium and the activity of the sodium chloride in each layer is therefore equal inspection of Table 2 shows that in acetone-water mixtures the partition coefficient for sodium chloride between the water-rich lower layer and acetone-rich upper layer is 40 1. If in the present case of a two-liquid water-butanone mixture the partition of sodium chloride between the water-rich phase and the butanone-rich phase is of a similar magnitude calculations indicate that the concentration of sodium chloride in the water-rich phase will be higher than in both the butanone-rich phase and the original 8 wt solution of distilled water in butanone. Table 2. Solubility of sodium chloride in aqueous solutions of acetone at 20 c Weight acetone Lower layer Upper layer g NaCI per 100 cm1 of solution 304 1 he weight of sodium chloride in the 168 kg of the liquor used in