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Effect of Polishing Mirror Plating of Chrome Rod on the Quality of Plating
Jun 11, 2018

Before the chrome-plated piston rod is plated, the surface of the chrome-plated piston rod needs to be prepared accordingly. This is because for the piston rod, the surface roughness before plating has an important influence on the quality of the plating. Under the same chrome plating thickness requirement, the surface roughness of the piston rod before plating is worse, and the surface quality of the chrome plating layer of the chrome plating piston rod after plating is not ideal.


Not only will the surface roughness be poor, but also the higher the porosity, the more incomplete the coating on the surface of the chrome plated piston rod, the poor adhesion of the coating to the surface of the workpiece, and it will be easier to rust and affect the service life. Then, what are the different requirements for the plating quality of different substrate surface roughness? In general, as the surface roughness of the substrate decreases, the hardness of the specimen increases, and the hardness indentation decreases accordingly. This is because the smaller the substrate surface roughness, the denser the chrome plating layer and the higher the hardness.


At the same time, in the process of treating the chrome-plated piston rod, different degrees of cracks appearing around the hardness indentation can also indicate the degree of compactness of the chrome plating layer, thereby reflecting the hardness of the chrome plating layer. For example, when a certain load is reached, micro-cracks appear around the hardness indentation, and as the load increases, cracks around the hardness indentation become more and more.


So, under what kind of circumstances can we prove that the compactness of the chrome-plated piston rod reaches a more ideal state? Generally speaking, under all loading conditions, no micro-cracks appear around the hardness indentation, which means that the chromium plating layer is more compact. When the surface roughness of the substrate continues to decrease, the chromium plating layer formed is more even and smooth, the interface between the plating layer and the substrate is clear, the bonding is tight, and no defects such as blowholes and cracks are found.


Comprehensive analysis, in fact, when the surface roughness of the substrate used is in an appropriate range, the surface quality of the resulting chrome-plated piston rod tends to be flat and dense, the thickness of the chromium plating layer decreases, and the hardness increases relatively, and the chromium plating layer in the The number of microcracks is significantly reduced. Therefore, in order to ensure a complete chrome-plated layer and extend the service life of the chrome-plated piston rod, it is first necessary to control the surface roughness of the piston rod within an appropriate range in order to improve the integrity of the chrome plating layer. http://www.xhychromerod.com/