How to maintain nickel plating electrolyte for electric heating tubes?

How to maintain nickel plating electrolyte for electric heating tubes?

95. How to maintain nickel plating electrolyte?

Answer: Nickel plating electrolyte is sensitive to impurities and should be kept clean and pure frequently. During use, in addition to preventing iron, copper, and parts from falling into the tank, the plating tank should be immediately covered after use. The conductive copper rod with suspended anode should be covered with plastic sheet or film. If dirt is found floating on the surface of the solution, carefully remove it with a gauze net. To avoid the nickel mud and dirt that have already settled at the bottom of the tank from floating up, it is not advisable to use strong stirring during operation without continuous filtration equipment to avoid stirring up the sediment and affecting the quality of the coating.

96. Why can double layer nickel plating improve the protective performance of the nickel layer?

Answer: Double layer nickel refers to the deposition of a semi bright nickel (or ordinary dark nickel) with a sulfur free (or low sulfur content) columnar structure, followed by a fully bright nickel layer with a high sulfur content layered structure. The thickness of the first layer of nickel usually accounts for about two-thirds of the total thickness. The mechanical properties of the coating are mainly determined by the semi bright nickel (or ordinary dark nickel) layer with good toughness. Due to differences in sulfur content between two nickel layers, their electrode potentials also differ. Generally speaking, the potential of the first semi bright nickel layer is corrected compared to the full bright nickel layer. If semi bright nickel is completely sulfur free, then there is a relatively large potential difference (approximately 155MV) between bright nickel and semi bright nickel. In this way, when the fully bright nickel layer at the crack or pore of the chromium coating is corroded and penetrated into its lower layer of nickel, due to the potential difference between the two nickel layers, a primary battery can be formed. The first layer of nickel with a positive potential is the cathode in the primary battery, while the fully bright nickel with a negative potential is the anode in the primary battery. This allows the corrosion direction to develop from longitudinal to transverse, thereby improving the protective performance of the nickel layer.

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