12, loose dendritic coating. In the liquid bath, the main metal ion concentration is high, the complexing agent is low, the additive is low, the anode and the anode are too close, the current density is too large, and the dendritic coating is easy to be formed in the current region. Loose coating like foam, dendritic uneven, can be wiped with a finger coating.

13, double coating. The formation of double-layer coating occurs mostly in the bath of the operating temperature is relatively high, in the plating process to the workpiece plating tank and re-hanging from the new plating. In this process, if the workpiece for a long time, the workpiece surface of the bath due to evaporation of water precipitation salt frost attached to the workpiece, in the continued plating when the salt cream did not have time to dissolve, the coating is plated on the surface of the salt cream to form a double coating , Like Huafu biscuits, two layers of sandwich with a layer of salt cream.

14, the coating black. The main reason for the blackening of the coating is that the plating metal impurities and organic impurities are high, especially in the low current density area coating is more black; in the case of insufficient additives, in the middle of the plating area will also appear black coating; Activities are small, the current is high when the formation of gray-black coating.

15, passive state peeling. Activation before plating includes two chemical processes, one is the oxidation process, one is the oxidation process of the oxide. If the oxidation process is not sufficient or the oxide is too late to dissolve out, there is still oxide residue on the surface of the coating, the coating will be peeling or rough.

16, replacement peeling. Generally there are two different materials on the same workpiece.

17, oil pollution peeling. If the pretreatment of oil is not clean, there is no oil plating area plating, even if there is coating is also false plating, coating and the substrate is not binding force, like rubella block as a block uplift, a rub off.

18, dark round spot coating. When the impurities in the bath or less additive, in the middle of the heat block will be formed dark gray dark round spot coating, like a plaster. Because the central area of the large area is low current, the impurities are concentrated here. Or when the additive is insufficient, the bath depth capability is reduced.

19, the coating gloss uneven, while the thickness of the obvious (visual) uneven. This is due to the addition of additives, the additive is not fully dispersed, so that the bath characteristics are not uniform.

20, bath chemical fiber contamination, visible coating on the embedded with a trace of chemical fiber. Anodic bag PP cloth with iron iron to do the system can overcome this failure.

21, plating mold fungal contamination (more common in the nickel plating tank, because PH4-5 environment suitable for mold sinus), showing the plating layer embedded in a mold fungus bacteria. Encounter this situation to take disinfection and sterilization measures, in order to avoid mold pollution, we must pay attention to the production line of the opening of the cylinder program.

22, moss pollution of water quality. The workpiece is rinsed in water containing moss creatures, and the moss is adhered to the workpiece, and it is firmly attached to the workpiece after drying, affecting the quality of the product. Every spring should pay attention to the possibility of moss pollution, to establish a sense of prevention. If the moss is contaminated with the plating tank, the moss will be embedded in the coating.

23, the coating porosity is high. Most of the causes are bath dirty. Metal impurities and more. Organic impurities and more.

24, the same rack on the thickness of the coating a regular difference. This is because the anode and cathode graphics projection are not allowed (yin and yang relative position is not suitable), the power line distribution is not uniform.

25, the surface of the coating tin tumor. This is because the anode mud pollution bath, PP bag leak, the anode dissolved, on the one hand is the form of ions into the bath, some of the atoms. The form of radicals into the bath, pollution bath. When the atomic group contacts the workpiece, it is embedded in the plating layer to form tin.

28, black body color. This is due to the frame in the pre-plating or neutralization tank, stay in the lye for too long, the black body has been alkaline corrosion. The composition of the black body is epoxy. Leveling agent. Hardener. Anti-aging agent. White filler. Melanin, etc., when the black body is alkaline erosion will reveal the filler.

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