Dispersal ability and deep plating ability of electric heating tube electroplating

Dispersal ability and deep plating ability of electric heating tube electroplating

Temperature resistance

The higher the temperature resistance of the brightener, the better. However, if high temperature production requires a large current and an increase in the amount of brightener to ensure sufficient brightness, strictly speaking, it cannot indicate that the temperature resistance of the brightener is good. A simple identification method is recommended, which is to conduct comparative experiments with potassium chloride zinc plating bath solution under the same current, temperature, and other conditions. As is well known, potassium chloride zinc plating brighteners (such as zinc chloride No.1 additive) can achieve full brightness on IA, smin, or IA, 10 and n test pieces under conditions of 40-50 ℃, and there is basically no dark area in the low current density area. Therefore, the method of determining temperature resistance in potassium salt zinc plating can be used to determine the temperature resistance of alkaline zincate zinc plating brighteners, and cyanide zinc plating is also applicable.

During the experiment, under the same volume, temperature, current density, and electroplating time conditions, the two plating solutions were first tested at 40 ℃. After the IA and SMIN test pieces were illuminated, the difference in glossiness between the two was not significant. The overall brightness was uniform and there were no dark areas, indicating that the alkaline zinc plating brightener had good temperature resistance and was sufficient to meet normal hanging plating production; If the IA, 5, and n test pieces emit light at this time, the low current density area only drops to 1. The semi bright area of m can basically meet the requirements of hanging plating production. If the surface condition of the alkaline zinc plating brightener is basically the same as that of the potassium chloride zinc plating test piece at 45 ℃, then the temperature resistance performance of the brightener is excellent and all indicators are good.

2.3 Dispersion ability and deep plating ability

Under the condition of no stirring, conduct Hall cell tests with ZA and 20han, use iron plates as anodes, control the plating temperature at 20-30 ℃, and wash the test pieces with water after plating without any light or passivation. Using a Huo's scale, select the positions with current densities of 8.64 and 0.43A/d (1. SEM from the edge of the high current density area and 1.5. m from the low current density area), measure their thickness [5], and calculate the thickness ratio of the high and low current density areas. A better brightener has a thickness ratio between 2.0-2.5. If the thickness ratio is less than 1.5, it indicates that the current efficiency in the high and medium current density areas is low, which may affect production efficiency. However, the NaOH content, ZnZ+content, metal and organic impurities, and brightener content all affect the experimental results.

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