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Method for adjusting pH value of nickel-fluoric series normal temperature hole sealing liquid
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An adjustment method and a technology of sealing fluid, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of nickel salt waste, content imbalance, etc., and achieve the effect of improving the reaction speed
Active Publication Date: 2012-03-07
AEROSPACE SCI & IND KET TECH CO LTD
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Make Ni 2+ Unbalanced content, resulting in waste of nickel salt
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Embodiment 1 and comparative example 1
[0024] Adjust the pH value of the nickel-fluorine based room temperature sealing solution by the following two methods:
Embodiment 1
[0029] Normal temperature sealing liquid in embodiment 1:
[0032] The measured pH value is 5.3, then add malonic acid and sodium acetate according to the following ratio, and the pH value is adjusted to 5.5~7, preferably 6~7:
[0033] Nickel salt in the sealing solution: the molar ratio of malonic acid added=5:1~10:1 acid;
[0035] Specifically, in this embodiment, after adding 0.3 g / L malonic acid to the solution, the pH value is measured to be 5.1, and then sodium acetate is used to adjust the pH value to 6-7.
[0036] After adjustment, the composition of Comparative Example 1 is:
[0037]
[0038]
[0039] After adjustment, the composition of embodiment 1 is:
[0054] The measured pH value is 5.3, and then 3 g / L of sodium acetate is added to adjust the pH value to 5.5-7, preferably 6-7. Specifically, sodium acetate can be added according to the following ratio, the molar ratio of nickel salt in the sealing solution:malonic acid added=5:1˜10:1.
[0055] After the two solutions were used for 1 month, the pH value became 7.5, and the surface of the closed film layer was dull and powdery.
[0056] Adjust the pH value of the normal temperature sealing solution by the following two methods:
[0057] After adjusting the amount of the main salt to the initial value in Comparative Example 2, then add sulfuric acid to adjust the pH value of the solution. After adjustment, Comparative Example 2 becomes:
[0058]
[0059]
[0060] In embodiment 2, the amount of main salt is adjusted to initial value, then add malonic...
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Abstract
The invention discloses a method for adjusting pH value of nickel-fluoric series normal temperature hole sealing liquid, which comprises the following steps: adding sodium acetate for adjusting the normal temperature hole sealing liquid to the set range of the pH value if the pH value of the normal temperature hole sealing liquid is lower than the lower limit of the set range of the pH value; andadding acid for adjusting the normal temperature hole sealing liquid to the set range of the pH value if the pH value of the normal temperature hole sealing liquid is higher than the upper limit of the set range of the pH value. The adoption of the method for adjusting the pH value can quantitatively adjust the pH value of the normal temperature hole sealing liquid, thereby being simple and convenient, having high efficiency and leading the hole sealing effect of the hole sealing liquid after adjustment to be good.
Description
technical field [0001] The invention relates to the technical field of surface treatment of non-ferrous metals, in particular to a method for adjusting the pH value of a nickel-fluorine-based normal-temperature sealing liquid used on the surface of non-ferrous metals. Background technique [0002] The oxide film layer formed after the anodic oxidation of aluminum and aluminum alloy is a porous film. In order to increase the corrosion resistance and light resistance of the film layer, the film layer must be sealed. The existing more economical and applicable sealing method is mainly the normal temperature sealing method, and the commonly used relatively stable and reliable sealing fluid is mainly the Ni-F series normal temperature sealing fluid. Including the low-temperature sealing solution prepared by nickelsulfate, sodiumfluoride, wetting agent and preservatives proposed by patent application number US4648911; nickel sulfate or nickel acetate, ammonium acetate, potassium...
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