Influence of the Parameters of Galvanomechanical Chromium Plating on the Coating Quality and Process Productivity

Груба, О. Н.; Shmidt, I. V.; Gorodkova, Anastasia E.

doi:10.4028/www.scientific.net/ssp.284.1173

Cited by 3 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mechanical plating is a surface treatment process in which metal micropowder is adsorbed physically and chemically and deposited to form a plating layer, which is densified under the action of a mechanical collision force. Mechanical galvanizing is a process in which zinc powder is added to the surface of the substrate to obtain a galvanized layer [1][2][3]. Compared with traditional hot-dip galvanizing and electrogalvanizing, mechanical galvanizing does not involve a high-temperature metallurgical reaction and electrochemical accumulation effect during plating, and the obtained layer has advantages of no hydrogen embrittlement and an easily adjustable layer thickness [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Influence of rotational speed on the collision of mechanically plated galvanized layers based on discrete element method

Hao¹,

Wang²,

Wang³

et al. 2022

Surf. Topogr.: Metrol. Prop.

View full text Add to dashboard Cite

A discrete-element numerical simulation method was used to investigate the effect of plating barrel speed on the density of the galvanized layer during mechanical galvanizing. The motion behavior between the impact medium and the substrate in the plating barrel at five rotational speeds (20, 30, 40, 50, 60 rpm) was investigated. Laws of collision and contact force variation between the substrate and the impact medium were obtained. The average thickness, relative density, and average deviation of thickness of the galvanized layer specimens were obtained at the same rotational speed. The results were compared with those obtained from the simulation. The increase in barrel rotational speed decreased the number of contacts between the impact medium and the substrate, but made the change in the number of collisions more regular. This was conducive to a regular force on the zinc powder particles and made the galvanized layer more uniform and dense. The contact force between the impact medium and the substrate increased with an increase in barrel speed. At 20 rpm, the impact medium could not provide enough contact force to melt the zinc powder particles into the substrate surface. Contact force increased abnormally at 60 rpm, which caused some of the zinc powder particles that were attached to the surface of the substrate to fall off, which affected the plating thickening. The average thickness, relative density, and average deviation of the galvanized layer in the comparison test were consistent with the simulation results. From 30 to 50 rpm, the relative density of the galvanized layer increased with an increase in speed. The average thickness and relative density of the obtained galvanized layer were highest and the average deviation of the thickness was lowest at a barrel speed of 50 rpm. The relative density and uniformity of the galvanized layers were optimized.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of rotational speed on the collision of mechanically plated galvanized layers based on discrete element method

Hao¹,

Wang²,

Wang³

et al. 2022

Surf. Topogr.: Metrol. Prop.

View full text Add to dashboard Cite

show abstract

“…Based on this, the outer surface of the piston rod and the inner surface of the cylinder should be chrome-plated. Previously, a technology for applying chrome plating to the outer surfaces [12,13,14] and an installation for applying chrome plating to the inner surfaces of hydraulic cylinders [15] were developed.…”

Section: Introductionmentioning

confidence: 99%

Research on Chrome Plating Quality of the Internal Surfaces in the Hydraulic Drives with Hydrostatic Guideways

Ardashev

Yusubov

Shipulin

et al. 2021

MSF

View full text Add to dashboard Cite

The article presents a study of the characteristics of experimental samples with a chrome coating: the straightness and ovality of the inner surface of the cylinder, as well as the hardness and thickness of the chrome coating. The chrome coating is obtained on a previously developed installation for applying chrome coating on the inner surfaces of hydraulic cylinders of hydraulic drives with hydrostatic guides. The measurement of the geometric characteristics of the internal surface of the samples was carried out, the values of deviations from roundness and deviations from straightness were obtained. A study of the chrome coating was carried out, for this we cut out sectors from the samples, carried out their sample preparation, measured the hardness and took pictures under a microscope, measured the hardness and thickness of the chrome coating. The obtained measurement results: deviation from roundness, deviation from straightness, coating hardness, coating thickness - correspond to the specified technical requirements, the proposed construction of the installation for applying chrome coating to the inner surfaces and the electrolyte composition, selected earlier, are applicable for chrome plating of the inner surfaces.

show abstract

“…To this end, hydrostatic guideways are used in hydraulic drives, and it is also necessary to chromium-plate the outer surface of the rod and the inner surface of the cylinder. Previously, we developed a method for applying a hard chromium coating on outer surfaces [12,13,14], which can be used to machine the rod. To apply a hard chromium coating on the inner surfaces of a hydraulic cylinder, we must develop the composition of the chromium electrolyte and the modes of application which ensure the maximum coating quality and process performance.…”

Section: Introductionmentioning

confidence: 99%

Aspects of Applying Hard Chromium Coatings on the Inner Surfaces of Components for Hydraulic Drives with Hydrostatic Guideways

Ardashev

Shipulin

Degtyareva-Kashutina

2021

SSP

View full text Add to dashboard Cite

We considered the processes of chromium plating the inner surfaces of the components of cylinders with hydrostatic guideways. We demonstrated the various aspects of the chromium plating process – the limitations placed on the machinery depending on the dimensions of the parts to be plated and the unevenness of the deposition rate of chromium along the length of the part. We developed a diagram of an installation for the application of a hard chromium coating on inner surfaces, which includes a cathode, an anode, a tank, and a pipeline. The distinctive features of the installation are the method of supplying the electrolyte at an angle to the horizontal, which allows us to supply the electrolyte through a turbulent flow swirling along a helical path, and the use of a chromium-plated installation casing. We studied various modes for applying a hard chromium coating on the inner surfaces of a hydraulic cylinder. As a result, we determined the optimal composition of the chromium electrolyte – the ratio of chromic anhydride and sulfuric acid – which is 10:1, respectively, and experimentally selected deposition modes. Chromium coatings obtained through the use of the concentrated electrolyte, which we developed, and the chromium plating method have 5...20% greater hardness and a 10...30-times reduction in porosity with the formation of a shiny, lumpy sludge, which corresponds to corrosion-resistant and wear-resistant coatings needed to manufacture hydraulic drives with highly efficient hydrostatic guideways.

show abstract

Influence of the Parameters of Galvanomechanical Chromium Plating on the Coating Quality and Process Productivity

Cited by 3 publications

References 6 publications

Influence of rotational speed on the collision of mechanically plated galvanized layers based on discrete element method

Influence of rotational speed on the collision of mechanically plated galvanized layers based on discrete element method

Research on Chrome Plating Quality of the Internal Surfaces in the Hydraulic Drives with Hydrostatic Guideways

Aspects of Applying Hard Chromium Coatings on the Inner Surfaces of Components for Hydraulic Drives with Hydrostatic Guideways

Contact Info

Product

Resources

About