Solution for blistering solution of iron wire coating
Alkaline zincate solution except oil and activation ability worse than cyanide zinc plating bath and so on the front of the handle requirements than cyanide zinc plating high, in addition to oil is not complete or acid corrosion and excessive cause coating blistering. But this kind of plating liquid blister easily the main reason is organic additives on the amorphous layer on the surface of the adsorption, the original crystal or crystal surface can not be normal growth, led to the emergence of new crystal nucleus or some crystal face abnormal development; or is organic additives in the coating is attached, hinder the normal alignment of lattice, causing distortion of crystal lattice, so as to increase the internal stress of coating, coating caused by foaming. Is generally additive dosage the more, bath temperature becomes low, adding adsorption on the electrode surface with the larger; so that the coating has greater stress and more blister easily.
Quality additive of coating blistering also have an impact, some additive synthesis reaction is not complete, in the long-term storage or during long-term use of a continuous polymerization process, such additives may easy to make the lattice distortion and stress, resulting in plating foaming.
When the coating is foaming, the temperature of the plating bath is checked first.. If the temperature of the plating bath is not low, the addition of oil before plating and preventing the corrosion of matrix metals in acid. If you pay attention to these problems, foaming phenomenon still exists, it should pay attention to the dosage of additive and quality, then you can stop to add additives, with high current electrolysis for a period of time, to reduce the additive content observed foaming phenomenon is improved. If there is still no improvement, it should check the storage period of the additive is too long, or whether the impurities in the additives are too many. A factory had done a test, using industrial grade raw materials for the synthesis of DPE - I, added to the plating solution for electroplating, plating foaming, and with higher purity of raw materials for the synthesis of DPE - I, added to the plating solution for electroplating coating was not foaming. Then they will be industrial grade raw material synthesis of DPE - I, in use before first electrolysis for a period of time, and then use, foaming phenomenon basically did not appear to, the factory test proof, the purity of the additives on the coating blistering effect, it should be noticed.
If the coating is caused by the bad quality of the additive, then on the one hand, deal with the plating solution, and the method can be used for active carbon or potassium permanganate activated carbon. According to the data lg/LBa (OH) 2 and 1g/LCa (OCL) 2 bath, the effect is very good. Another additive on unused, before use of electrolytic treatment, to reduce additive impurities in plating foaming effect.
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