Notes

Evaluation of Peeled-off issue for Electro-plating and Powder covering parts
1. Causes result in layering layers peeled off as well as safety nets for Electro-plating parts:
1) The crucial to attaining great adhesion is to make certain an energetic metal surface adequately devoid of oils, oxides, alloying additions or warmth treat range. If pretreatment is not well done, the contaminations remained on steel surface will certainly weak the adhesion.
Preventive measures: inspect every set to ensure the elimination of oil is extensive, the cleaning water is tidy, the focus of acid leaching option is heavy as required and also the etching time is enough.
2) It might be that the disturbance of the current in the electroplating procedure causes the poor mix in between the nickel layer and also product, and this existing interruption phenomenon may be caused by the inadequate conductivity of the hanging tool.
Preventive measures: everyday check the hanging devices to ensure there is no damage.
3) When the brightener is added too much, the bonding pressure between layering layers is not good.

Preventive measures: day-to-day check the electro-plating service including brightener to be made according to criteria.
4) PH value, electrical current, temperature level might additionally be the reasons.
Safety nets: everyday check the electro-plating solution and also plating tools.
2. Reasons lead to incomplete and also peeled-off finishing and also safety nets for Powder layered parts:
1) Insufficient covering:
If the coating line is automatic, it could be the reasons that the revolving speed of hanging gadgets and distance between components and blowguns are as well far or as well close. The small positions inside the tooth cavity can not be completely covered with layer powder.
If the finishing line is hands-on, workers really did not carry out a qualified job.
Preventive measures: For automated covering line, established the correct turning rate of hanging distance between parts and blowguns. For manual line, train the employees to work even more mindful and inspect every item.
Stainless steel Investment Casting
2) Peeled-off covering:
Keys reasons could be Pretreatment insufficient, Drying time also short or temperature level as well low.
Preventive measures: Pretreatment to get rid of the contaminations have to be comprehensive, such as oil, lubricating substance, oxides, alloying inclusions or warm treat range.
Lengthen the drying time or set up a greater drying out temperature level according to function direction.


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