Bearings - Bearing friction reduction of the plating process outlined in (4) 05/16/2008 Europe/London +0100 BST

Fruit is too low in the bath too much concentration polarization, current or not to effect a flow-stripe coating defects and pyramid-shaped structure of the micro-Kim Sang, intuitive to reflect on the rough coating. If the content is too high so that on the one hand bath with a loss increases, increased costs on the other hand in the air

Wen low-prone boric acid (H3BO3) and the precipitation of additives, resulting in rough coating. DK is appropriate to the content of the provisions of the ceiling and crystal coating and meticulous in following the temperature dropped to 15 ℃, in the bath should have no additives and the boric acid precipitation phenomenon.

4.2.2 free fluoride boric acid (HBF4) concentration of its primary role for the anode to normal dissolved; prevent the price of tin (Sn2 +) and the suppression of the major ions (Pb2 +, Sn2 +, Cu2 +) hydrolysis to improve the stability of bath ; I. Introduction and Ball Bearing China Bearing Review improve the ability of decentralized; refined crystalline

. Reported in the literature in the range of 40 ~ 300 g / ι. When the boric acid free fluoride content is too low, it dissociation from the hydrogen ions (H +) concentration of low, may occur in the following bath hydrolysis; Pb2 + +2 H2O <==> Pb (OH) 2 ↓ +2 H + Sn2 + + 2H2O <==> Sn

(OH) 2 ↓ +2 H + Cu2 + +2 H2O <==> Cu (OH) 2 ↓ +2 H +. They all generate hydroxide precipitation and suspended in the bath. Electroplating, they adhesion to the substrate surface or inclusion in the coating, and it makes the coating and substrate binding force between the fall and the crisp coating, the Rough

, From Huaban, coating the wear-resistance and anti-fatigue properties decreased significantly. When the solution of boric acid content of fluorine free too high, in the plating of the high current density, that is, bearing a burr or sharp edge of the places, such as a hydrogen End precipitation. As a result, the coating on Bush

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