One , not color dye
1, the anodic oxide film thickness is insufficient. The solution is to check whether the anodizing process specifications, see the temperature , voltage, electrical conductivity and other factors are stable , if unusual , adjust the specification , without exception , may be extended oxidation time , to ensure compliance thickness .
2, the dye high pH , time, glacial acetic acid and the pH was adjusted to the specified value .
3 , after oxidation workpiece placed in the sink too long . Promote dyeing time , if this condition has occurred , the workpiece can be placed in the anodizing bath and the bath or nitric acid activation treatment after appropriate for dyeing , the effect will be good.
4 , the choice of dye properly. Need to choose a suitable dye.
5 , the dye is decomposed or mildew , this time in need of replacement dyes.
6, the oxidation temperature is too low , leading to dense film . May be appropriate to increase the oxidation temperature .
7 , poor conductivity . Anode or cathode rods may stereotype bad batch shown poor conductivity . Pay attention to cleaning the anode and the cathode rods stereotype , to ensure good contact.
Two , white point ,
1 , washing is not clean , we should strengthen water.
2 , the water used for washing dirty , polluting the film , you should replace the water , to ensure the quality of washing .
3 , the oxide Aluminum Film by the dust in the air , acid, alkali fog contamination. Strengthen washing, dyeing and timely , timely transfer substantially relieve this symptom.
4 , the oxide film by oil , perspiration pollution. The need to strengthen protection, can not touch the exterior surface of the workpiece .
5 , there is no dye dissolved impurities , by the oil pollution , disruption of normal coloring , this time should be filtered or replaced dye .
6 , the workpiece gap , there is residual acid outflow hole for such work to strengthen the water.
7 , by Cl- dye contamination caused pitting piece dyeing , the dye must be replaced , usually during the operation should be taken to avoid the introduction of impurity ions .
Third, the light color , color
1, the film thickness unevenness . Possible reasons anodizing bath temperature , density unevenness , response bath stirring compressed air to substantially solve this problem .
2, the temperature of the dyebath or uneven density . Into mixing process .
3 , dyeing too fast. First into the bottom of the workpiece and the last to leave the dye in the dye , so the bottom of the most easily stained . The solution is to dilute the dye , an appropriate extension of the dyeing time .
4 , poor conductivity . May be caused by loose hanging , hang tight attention to avoid such problems.
5 , the dye is too thin, the dye may be added to improve the density.
6, the dye temperature is too low . Can give less dye was heated to 60 ℃ .
7, the dye is dissolved improper , or floating in the insoluble dye , which is easy to produce this color. The solution is to improve the dye dissolved.
Four , dyeing blur, color escape
1 , dye low pH , can dilute ammonia transferred to the specified value .
2 , cleaning is not clean. Washing should be strengthened .
3 , the dye does not dissolve completely , enhanced dissolution caused completely dissolved.
4, the dyeing temperature is too high , reduce the temperature.
5, the oxide film is small pores , because the oxidation temperature is too low , inhibiting coating is dissolved in sulfuric acid , may be appropriate to increase the oxidation temperature to avoid this problem .
6 , dyed color fast, and dyeing time is too short , adjustable dilute dye , reduce dyeing temperature , appropriate to extend the dyeing time .
7, the sealing temperature is too low , heating solution .
8 , sealing pH value is too low, with dilute ammonia raised to the specified value .
9 , stained surface is easy to wipe off . Mainly rough coating , generally caused by the oxidation temperature is too high . Should pay attention to control the oxidation temperature in the specification range.
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