Double layer chromium electroplating processing process for conveying cylinder

A processing technology and conveying cylinder technology, which is applied in the field of concrete conveying cylinder processing technology, can solve the problems of poor bonding force between coating and cylinder body metal, shortening the service life of conveying cylinder, and high hardness of chromium layer, so as to avoid the peeling of chromium layer and prolong the Corrosion battery time, corrosion resistance and bonding force improvement effect

Inactive Publication Date: 2009-04-29
娄底市中兴液压件有限公司
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  • Application Information

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Problems solved by technology

[0002] Traditional conveying cylinders are mostly directly plated with a high-hardness wear-resistant chromium layer on the surface of the cylinder body. The chromium plating process is simple, the initial working temperature is low, and the process control is convenient. However, due to the high hardness of the chromium layer, large internal stress, and ductility It is very small, forming a large contrast with the substrate material with lower hardness and better ductility, and during

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  • Double layer chromium electroplating processing process for conveying cylinder

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Embodiment 1

[0021] As shown in the accompanying drawings, the production process of the present invention is carried out according to the following steps.

[0022] a. To prepare the electroplating solution, use 220-250 g / L CrO 3 solution and 2.5-3.1 g / L of H 2 SO 4 Solution by CrO 3 with H 2 SO 4 The weight ratio is 100:1.15 and mixed evenly to form electroplating solution 1;

[0023] b. Pour the prepared electroplating solution 1 into the electroplating tank;

[0024] c. Increase the temperature of the electroplating solution 1 in the electroplating tank to 68°C to form the pre-plating plating solution 2;

[0025] d. Put the clean delivery cylinder into the electroplating solution of the electroplating tank and preheat it to the temperature of the electroplating solution to form the delivery cylinder 3 to be plated;

[0026] e. Pass 15A / dm to the electroplating tank 2 Reverse power supply for back-etching and etching, and further remove the sundries on the surface of the conveyin...

Embodiment 2

[0032] This embodiment is basically the same as Embodiment 1, the difference is that in technical step a, CrO 3 with H 2 SO 4 The weight ratio is 100:1.25, the temperature of the electroplating solution in technical step c is increased to 72°C, and the reverse power supply current in technical step e is 25A / dm 2 , the forward current in technical step f is 25A / dm 2 , the temperature of the plating solution in technical step g drops to 57°C, and the current in technical step h increases to 45A / dm 2 .

Embodiment 3

[0034] This embodiment is basically the same as Embodiment 1, except that what adopts in technical step a is CrO 3 with H 2 SO 4 The weight ratio is 100:1.2, the temperature of the electroplating solution in technical step c is increased to 70°C, and the reverse power supply current in technical step e is 20A / dm 2 , the forward current in technical step f is 20A / dm 2 , the temperature of the plating solution in technical step g drops to 55°C, and the current in technical step h increases to 40A / dm 2 .

[0035] The above three embodiments can draw the following conclusions: the use of electroplating solutions of different components, temperature, and current to electroplate the delivery cylinder with milky white chromium and hard chrome can make the delivery cylinder plated with double-layer chromium, wherein the inner layer is milky white Chromium, the outer layer is hard chromium, wherein embodiment three is the best embodiment; during the preparation of electroplating so...

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Abstract

The invention provides a bilayer-chromium electroplating machining process for transport cylinders. The process comprises the following steps of making a CrO3 solution and an H2SO2 solution into an electroplating solution according to a certain proportion, putting the electroplating solution into an electroplating bath, heating to a certain fixed value, placing and preheating a transport cylinder in the electroplating bath, removing impurities, plating the transport cylinder with 20 to 30 microns of milky white chromium at 15 to 25 A of current per dm<2>, cooling the transport cylinder to a certain temperature, adopting a stepped current raising method to raise the current to 35 to 45 A per dm<2> and plating the transport cylinder with 280 to 300 microns of hard chromium, so as to obtain the transport cylinder plated with bilayer-chromium. The transport cylinder manufactured through the process can effectively prevent chromium layers from falling off caused by corrosion or prevent burst caused by insufficient bonding strength, thereby greatly increasing the life span of the transport cylinder.

Description

Technical field [0001] The invention relates to a processing technology of a conveying cylinder, in particular to a processing technology of a concrete conveying cylinder of a concrete pumping system of heavy construction machinery. Background technique [0002] Traditional conveying cylinders are mostly directly plated with a high-hardness wear-resistant chromium layer on the surface of the cylinder body. The chromium plating process is simple, the initial working temperature is low, and the process control is convenient. However, due to the high hardness of the chromium layer, large internal stress, and ductility It is very small, forming a large contrast with the substrate material with lower hardness and better ductility, and during use, due to the release of the internal stress of the coating, the original micro-cracks in the local coating expand and deepen to reach the substrate, resulting in concrete grout It penetrates into the cylinder body and forms a corrosion cel...

Claims

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Application Information

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IPC IPC(8): C25D3/04
Inventor 张树芳颜高社王火成
Owner 娄底市中兴液压件有限公司
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