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Nickel plating method using sodium hydrosulfite to remove the discussion of hexavalent chromium


Mix 4 hours; ③ check oxygen added water 5g, l stirred 4 hours,[link widoczny dla zalogowanych], remove the excess sodium hydrosulfite classes and some organic impurities; ④ tune phi6.2. And heated to 6O ℃ above the insulation. To step on the excess hydrogen peroxide; ⑤ plus carbon 5g / l, stirred 4 hours. Standing overnight: @ filters; ⑦ Lan pH to 4.5, added after plating brightener test found that hexavalent chromium plating solution still exists,[link widoczny dla zalogowanych], at first suspected to be caused by operational errors. Then the above process is still dealing with hexavalent chromium plating solution was found, began to suspect this is the wrong treatment process itself, in addition, to this end a number of tests. Mau is indeed the result of this move. 2. Test in case ~ CrC1 ・ 6HtO preparation of containing Cr \color reagent, this reagent slightly acidic conditions in the case of Cf \= 40mgllpH = 6. 5 Table l i-l2 an exemplar of that: in the. oH 5.5 conditions, less than 100 ℃ temperature. Will not be turned into trivalent chromium Cf \Wong Wong has 70 ℃ 'There are 80 ℃ 90 ℃ Huang Hong Huang Hong Hong has suffered a L 100 ℃ Test 2: Cr. = 40rag/1H202 = 5g/1pH = 5.5 in Table 2,[link widoczny dla zalogowanych], Table 2 shows that: cr \40rag / 1, H202 = 5g / 1, pH = 5.5 conditions, when the temperature is lower than S0 ℃, cr \\= 40mg/lH2O2-4g/lpH = 3.0 in Table 3 Table 3 blue no - no Table 3 shows that: cr. \Improved ..; v _ from the beginning of this article Test mention § shows a factory treatment process, when heated to remove hydrogen peroxide,[link widoczny dla zalogowanych], trivalent chromium into hexavalent chromium will stay in solution, according to test 2 and test 3, two sets can be designed Process for reference: (a reducing agent for example sodium hydrosulfite) (1) adjusting the pH <3.0-÷ insured by adding hydrogen peroxide to remove excess powder and sodium hydrosulfite to remove some organic impurities - ÷ pH adjusted to 6.2-A adding activated carbon - ÷ Filter - ÷ heated to remove excess hydrogen peroxide. (Note: The steps in the filter before the rhyme, must ensure that the temperature below 50 ℃): (2) N ~ H <o.3-÷ insured powder - ÷ adding hydrogen peroxide to remove excess sodium hydrosulfite and the removal of some organic impurities - ÷ heated to above 60 ℃ to remove hydrogen peroxide (must be completely rid of) - ÷ adjust pH by adding carbon to the 6.2-÷ - ÷ filtering 4. Conclusion (1) chromium converted to hexavalent chromium (in acidic conditions) reaction mechanism needs further study. (2) Cr \, while in FH = 5.5 conditions, the temperature is higher than 60 ℃ turned into trivalent chromium to hexavalent chromium, and I think that there must be between the pH3-5 is a critical value, subject to further search. (3) stressed the point: hydrogen peroxide in the presence of trivalent chromium and conditions, and pH when compared with 'l the temperature should not be too high, or hexavalent chromium can not be removed, affecting the treatment effect of nickel plating. Fourth, strategies and measures we can see from the above analysis; amidine oil aging is due to the accumulation of oil in addition to the grease and dirt caused. In practice, Health: l1 can be used as a number of measures and countermeasures; 1. Timely adjust the ingredients except oil. New technology with lower cylinder to control the oil removal can meet the requirements to be used for a period of time and gradually increase to the process limit. 2. Replacement of all or part of a regular basis to ensure that a certain addition to the freshness of the oil. 3. Conditional units can often fluid filtration and purification addition to the lake, and promptly cleared regularly Bottom fishing amidine oil sludge. One blue one blue canthus
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