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Continuous chrome plating device and method for large rods

A rod and large-scale technology, which is applied in the field of continuous chrome plating device for large hydraulic cylinder piston rod, can solve the problems that the surface of the rod is easy to oxidize and affect the bonding force of the electroplating coating, so as to reduce hydrogen embrittlement, avoid floating rust and passivation layer , The process is simple and effective

Active Publication Date: 2017-04-26
CSIC ZHONGNAN EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It also records that when entering the electroplating tank, the surface of the rod is maintained with water to reduce the air-burst time on the surface of the rod and avoid oxidation on the surface of the rod. However, for large rods, such as long rods exceeding 8 meters, the air-burst time After about 8 hours, the surface of the rod is still easy to oxidize, which affects the bonding force of the electroplating coating

Method used

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  • Continuous chrome plating device and method for large rods
  • Continuous chrome plating device and method for large rods

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Such as figure 1 , 2 Among them, a large continuous chrome plating device for rods comprises an electroplating tank 6, which is provided with a through hole for the rods to pass through, and a front bracket 1 and a rear bracket 10 are arranged at both ends of the electroplating tank 6, and the front bracket 1 And the rear support 10 is provided with multiple groups of driving rollers 12, and every group of driving rollers 12 is driven by independent motors and reducers, and then all motors are regulated by frequency converters. A screw lifter 11 is also provided on the front support 1 and the rear support 10 . A front follow-up conductive frame 2 is provided above the front support 1, a rear follow-up conductive frame 9 is provided above the rear support 10, and a conductive element that rotates with the rod is provided on the front follow-up conductive frame 2 and the rear follow-up conductive frame 9. . A rotary sanding device 3 is provided between the front follow...

Embodiment 2

[0035] On the basis of embodiment 1, a kind of method that adopts above-mentioned large bar continuous chrome plating device to carry out continuous chrome plating may further comprise the steps:

[0036] 1. The processed rods are directly cleaned and degreased without pickling;

[0037] Use alcohol or gasoline to clean and degrease the rod as a whole;

[0038] 2. Sanding directly after cleaning and degreasing;

[0039] 3. Spray transition protection fluid after sanding;

[0040] 4. Enter the electroplating tank for continuous electroplating;

[0041] Through the above steps, the continuous chrome plating of the piston rod of the large hydraulic cylinder is realized.

[0042] In the sanding step, use a scouring pad to rotate along the circumferential direction of the rod at a speed of 20-30r / min, and continuously rinse with water at 60-70°C during the sanding process.

[0043] In the step of spraying the transitional protection liquid, use the protection liquid prepared by...

Embodiment 3

[0048] On the basis of Examples 1 and 2, the piston rod specification is 200mm in diameter × 8105mm in length, and the chrome plating process is as follows:

[0049] 1. Degreasing and cleaning: Use alcohol to clean and degrease the surface of the rod as a whole. Alcohol is preferably anhydrous alcohol. Avoid the risk of increased floating rust formation caused by cleaning with water-based degreasers.

[0050]2. Sanding: Use a scouring pad to rotate and sand along the circumference of the rod, and press it on the surface of the piston rod through the compression spring 3-6, the speed is 30r / min, and the washing water temperature is 60°C.

[0051] 3. Transition protection: use 6g / L anhydrous sodium carbonate solution, which is prepared from anhydrous sodium carbonate and distilled water. Spray the surface of the rod with a flat nozzle to ensure that the anhydrous sodium carbonate solution is not missed and evenly distributed on the surface of the rod.

[0052] 4. Chromium pla...

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Abstract

The invention discloses a continuous chromeplating device and method for a large rod. A through hole allowing rods to pass through is formed in an electroplating bath; a front support and a rear support are arranged at two ends of the electroplating bath; a front follow-up electric conduction frame is arranged above the front support; a rear follow-up electric conduction frame is arranged above the rear support; a rotary sanding device is arranged between the front follow-up electric conduction frame and the electroplating bath; and a transitional protection device is arranged between the rotary sanding device and the electroplating bath. The continuous chromeplating method comprises the following steps: first, cleaning and degreasing; second, sanding directly after cleaning and degreasing; third, spraying a transitional protection liquid after sanding; and fourth, entering the electroplating bath and electroplating continuously. According to the steps, continuous chromeplating for a large hydraulic cylinder piston rod is achieved; the rotary sanding device is adopted, so that floated rust and passivation layers can be eliminated effectively, and the binding force of the plated layer is enhanced; the method of cleaning with an organic solvent is used, so that the risk of floated rust generation is avoided; an acid pickling process is canceled, so that hydrogen embrittlement can be reduced; and the transitional protection process avoids regeneration of floated rust and passivation layers before plating.

Description

technical field [0001] The invention relates to the field of chrome plating, in particular to a continuous chrome plating device and method for piston rods of large hydraulic cylinders. Background technique [0002] At present, when the piston rod of a large hydraulic cylinder adopts the method of continuous chrome plating, the traveling speed of the rod is generally 0.8-1.2m / H, and it usually takes 10-20 hours to complete one. The rod is exposed to the air for a long time, and it is difficult to avoid floating on the surface. Rust and passivation layers affect the bonding force of the coating. Existing chrome-plated rods are usually subjected to a pickling activation process, but the pickling step is easy to form hydrogen embrittlement, resulting in a decrease in plasticity and strength of the material. Moreover, the pickling solution is usually prepared with water as a solvent, which increases the risk of floating rust formation. [0003] Chinese patent document CN102372...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D17/00C25D5/34C25D7/00
Inventor 姚明锋陆京陈杰向恒媛
Owner CSIC ZHONGNAN EQUIP
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