Comparative study of the main properties associated with thin layers of coatings with the cobalt-chromium-tungsten alloy (stellite) and hard chromium plating used as reinforcements for wood sawing

2021 ◽  
Vol 152 ◽  
pp. 103637
Author(s):  
Jhonattan Trejo ◽  
Ramón Tolosa ◽  
Néstor Ruiz ◽  
Pablo Ninin ◽  
Carmen Fuenmayor ◽  
...  
Keyword(s):  
Comparative Study ◽  
Thin Layers ◽  
Tungsten Alloy ◽  
Cobalt Chromium ◽  
Hard Chromium ◽  
Chromium Plating

scholarly journals Study on the Microstructural Characteristics of Some Metallic Layers Produced Using the Electrochemical Method and Thermal Spraying

2001 ◽  
Vol 71 (3) ◽  
pp. 166-177
Author(s):  
Roxana Alexandra Gheta ◽  
Ionelia Voiculescu ◽  
Ion Mihai Vasile ◽  
Georgiana Chisiu
Keyword(s):  
Wear Resistance ◽  
Thermal Spraying ◽  
Thin Layers ◽  
Alternative Methods ◽  
High Wear Resistance ◽  
Chemical Compositions ◽  
Microstructural Characteristics ◽  
Hard Chromium ◽  
Chromium Plating ◽  
Composite Layers

The paper presents the comparative analysis of the microstructural particularities and the superficial characteristics (microhardness and wear resistance) of 3 methods of producing composite layers on metallic support. The aim of the research was to study the possibility of replacing the hard chromium plating process by the thermal metallization process, in order to produce layers resistant to wear and corrosion. Samples produced by hard chromium plating (layers deposited by electrolysis), samples loaded by thermal metallization with electric arc and G3Si1 wire, and samples loaded by thermal metallization with oxy-gas flame and detonation (HVOF) using tungsten carbide as filler material were used in this study.Hard chromium plating allows for high wear resistance thin layers to be produced, but the process is cumbersome and polluting. Thermal metallization allows the production of composite layers, of a chemical composition selected according to the operational demands, in much shorter times and at lower costs. In order to ensure a higher adhesion and to reduce the mechanical stresses at the support-hard layer interface, an intermediate layer of nickel was deposited in the case of samples loaded by thermal metallization with wire. In the paper, the microstructures in cross-section were analysed, the chemical compositions were determined on micro-zones related to the diffusion from the support material and the microhardness in the deposited metal and in the thermally affected zones was measured. These studies have shown that composite metallic layers displaying satisfactory mechanical and microstructural characteristics can be produced using alternative methods (thermal metallization) if optimum regime parameters are chosen.

STOODY 4

Alloy Digest ◽  
1977 ◽  
Vol 26 (4) ◽  
Keyword(s):  
Solid Solution ◽  
Compressive Strength ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Heat Treating ◽  
Tungsten Alloy ◽  
High Temperature Strength ◽  
Cobalt Chromium ◽  
Temperature Performance

Abstract STOODY 4 is a cobalt-chromium-tungsten alloy with excellent high-temperature strength and excellent resistance to corrosion. This alloy derives its high-temperature strength from the high tungsten-to-carbon ratio which allows a large percentage of tungsten to remain in solid solution. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength. It also includes information on high temperature performance and corrosion resistance as well as heat treating, machining, and joining. Filing Code: Co-75. Producer or source: WRAP Division, Stoody Company.

Retentive Forces of Removable Partial Denture Clasp Assemblies Made From Polyaryletherketone and Cobalt‐Chromium: A Comparative Study

2021 ◽  
Author(s):  
Frank I. Gentz ◽  
Daniel I. Brooks ◽  
Peter C. Liacouras ◽  
Anton Petrich ◽  
Christopher M. Hamlin ◽  
...  
Keyword(s):  
Comparative Study ◽  
Cobalt Chromium ◽  
Removable Partial Denture ◽  
Partial Denture

scholarly journals Development of Ni-W alloy plating as a substitution of hard chromium plating

2016 ◽  
Vol 41 (1) ◽  
pp. 35-39 ◽  
Author(s):  
Sojiro Kirihara ◽  
Yashushi Umeda ◽  
Katsuhiko Tashiro ◽  
Hideo Honma ◽  
Osamu Takai
Keyword(s):  
Hard Chromium ◽  
Chromium Plating ◽  
Alloy Plating

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

2021 ◽  
Vol 316 ◽  
pp. 827-832
Author(s):  
D. V. Ardashev ◽  
L.V. Shipulin ◽  
A.S. Degtyareva-Kashutina
Keyword(s):  
Hydraulic Cylinder ◽  
Chromium Coating ◽  
Optimal Composition ◽  
Chromic Anhydride ◽  
Corrosion Resistant ◽  
Distinctive Features ◽  
Wear Resistant Coatings ◽  
Hard Chromium ◽  
Chromium Plating ◽  
Plating Method

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.

Effect of Abrasive Tools in Galvanomechanical Treatment on the Roughness of the Deposited Chromium Layer

2018 ◽  
Vol 284 ◽  
pp. 1178-1183 ◽  
Author(s):  
D.A. Zherebtcov ◽  
Oksana N. Gruba ◽  
K.R. Smolyakova
Keyword(s):  
Experimental Studies ◽  
The Body ◽  
Abrasive Tool ◽  
Chromium Layer ◽  
Pressing Force ◽  
Hard Chromium ◽  
Chromium Plating ◽  
Cylindrical Parts ◽  
Abrasive Tools

The article deals with the method of obtaining a hard chromium coating on details of the "body of rotation" type with the use of an abrasive tool. The influence of the composition and hardness of the elastic abrasive tool on the results of galvanomechanical chromium plating of rotating cylindrical parts has been studied. Binder compositions for an abrasive tool used to improve the roughness of the deposited chromium layer have been developed. A series of experimental studies has been carried out with chromium plating of steel cylindrical parts with simultaneous abrasive processing. Beforehand, an abrasive tool with previously developed binder formulations was manufactured. The obtained results of the influence of the characteristics of the abrasive tool and its pressing force on the chromium-plated part on the quality of the precipitated chromium made it possible to determine the optimum modes for obtaining a coating of the required thickness. Also, a suitable abrasive tool has been chosen to obtain a coating of proper quality.

Continuous hard chromium plating

1984 ◽  
Vol 31 (10) ◽  
pp. 14-15
Author(s):  
Erkii Muttilainen ◽  
Tapio Korpi
Keyword(s):  
Hard Chromium ◽  
Chromium Plating

scholarly journals A Hybrid Predictive Approach for Chromium Layer Thickness in the Hard Chromium Plating Process Based on the Differential Evolution/Gradient Boosted Regression Tree Methodology

Mathematics ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 959
Author(s):  
Paulino José Garcia Nieto ◽  
Esperanza García Gonzalo ◽  
Fernando Sanchez Lasheras ◽  
Antonio Bernardo Sánchez
Keyword(s):  
Differential Evolution ◽  
Layer Thickness ◽  
Optimization Technique ◽  
Regression Tree ◽  
Industrial Process ◽  
Metallic Surface ◽  
Chromium Layer ◽  
Boosted Regression Tree ◽  
Hard Chromium ◽  
Chromium Plating

The purpose of the industrial process of chromium plating is the creation of a hard and wear-resistant layer of chromium over a metallic surface. One of the main properties of chromium plating is its resistance to both wear and corrosion. This research presents an innovative nonparametric machine learning approach that makes use of a hybrid gradient boosted regression tree (GBRT) methodology for hard chromium layer thickness prediction. GBRT is a non-parametric statistical learning technique that produces a prediction model in the form of an ensemble of weak prediction models. The motivation for boosting is a procedure that combines the output of many weak classifiers to produce a powerful committee. In this study, the GBRT hyperparameters were optimized with the help of differential evolution (DE). DE is an optimization technique within evolutionary computing. The results found that this model was able to predict the thickness of the chromium layer formed in this industrial process with a determination coefficient equal to 0.9842 and a root-mean-square error value of 0.01590. The two most important variables of the model were the time of the hard-chromium process and the thickness of the layer removed by electropolishing. Thus, these results provide a foundation for an accurate predictive model of hard chromium layer thickness. The derived model also allowed the ranking of the importance of the independent input variables that were examined. Finally, the high performance and simplicity of the model make the DE/GBRT method attractive compared to conventional forecasting techniques.

Hard Chromium Plating of Large Cast Iron Drum-Drier Rolls

1950 ◽  
Vol 27 (1) ◽  
pp. 201-213
Author(s):  
A. W. Wallbank ◽  
G. W. Airey
Keyword(s):  
Cast Iron ◽  
Hard Chromium ◽  
Chromium Plating
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