Method for identifying porosity in electroplated electric heating pipe

Method for identifying porosity in electroplated electric heating pipe

The method to identify the porosity of the coating is to directly identify the characteristics of the plating solution. Hang the polished and degreasing stainless steel sheet into electroplating for about 0.5-1H. If the coating completely encapsulates the stainless steel sheet, and the coating can be scraped from the edge with a knife, the entire coating can be torn off, and the toughness is good to form a whole coated sheet. Align the coating sheet with the sunlight, if no pores can be seen, it proves that the characteristics of the plating solution are very good. The plating layer lifts up like fish scales, which proves that the characteristics of the plating solution are poor, and the plating solution needs to be treated.

The primary side of the electroplating heating tube is connected in series with blocking capacitance and saturation inductance

A blocking capacitor and a saturation inductor are connected in series on the primary side. During the zero-crossing period of the primary side voltage, the voltage on the DC blocking capacitor is used as a reverse blocking voltage source, so that the primary side current is quickly reset, creating a zero-current switching condition for the lag arm switch tube, and controlling the impedance of the saturated inductor in the desaturated area Great individual blocking and blocking capacitor reverse current. This type of design is the most widely used, but it also has some shortcomings. It is difficult to control the saturation inductance and determine the magnetic components. The saturation inductance works in a saturated to unsaturated melon, and the core heats up seriously. Moreover, if the saturable inductor is operated according to the maximum output voltage, the loss of the secondary side duty cycle is more serious at low voltage output.

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