Comparison the Vanadium Carbide Coating Created via Plasma Electrolytic Saturation and Termo Reactive Diffusion

Abstract

<p>One of the most important hardening methods of tool steel is the use of carbide coatings, in which during this process, vanadium diffuses in the specimen’s surface and reacts with carbon. During the Plasma Electrolytic Saturation Process, the vanadium element diffuses with the help of plasma and increases up to around 1000 degrees as a result of the temperature, providing conditions for the creation of vanadium carbide. On the other hand, the TRD method during which the specimen is placed inside a salt bath containing the vanadium for a long period of time and the vanadium carbide coating is formed. In this paper, an attempt is made to study the formed coating with the method of plasma electrolytic saturation in addition to comparing the coatings formed by these two methods and obtain some results like: vanadium carbide that created with TRD is purer than PES but that is thinner than plasma method, hardness of coating that created with TRD is about 2500vikers but in TRD is 1100vikers finally. In some PES samples the temperature increase slowly and the maximum temperature is about 120<sup>o</sup>C, in this condition, coating is non diffusion. Hardness of PES coating is about 1100vikers so we can use that in industrial molds.</p>

Characterization of VC Coatings on Cold Work Tool Steel Produced by TRD

“…TRD has the advantage that it can deposit homogenous and dense layers that can be applied to steels and alloys containing carbon that has percentages higher than 0.3 wt.% [10]. TRD is usually used to produce diffusion carbide coatings via one of three methods, pack cementation [11][12][13], fluidized bed [14][15][16], or molten salt bath [17][18][19][20][21] method (used in this paper).…”

Investigation of aluminum oxide coatings created by electrolytic plasma method in different potential regimes

“…PEO is a process for the chemical conversion of a metal surface into a hard oxide coating [18]. Aluminum is widely used in the aerospace and automotive industries due to its properties such as high corrosion resistance and high strength to weight ratio.…”

Corrosion behavior of aluminum oxide coatings created by electrolytic plasma method under different potential regimes

“…Aluminum also has many applications in the marine industry. The construction of high-speed vessels is perhaps the most tangible example of this application [4]. Aluminum has good corrosion resistance in many solutions, but in cases where it is in contact with high concentrations of aggressive corrosive agents such as chloride, severe local corrosion occurs [4,5].…”

“…The construction of high-speed vessels is perhaps the most tangible example of this application [4]. Aluminum has good corrosion resistance in many solutions, but in cases where it is in contact with high concentrations of aggressive corrosive agents such as chloride, severe local corrosion occurs [4,5]. In seawater environment, due to the high concentration of dissolved oxygen, especially chloride ions, the aluminum structures suffer from local corrosion.…”

“…In seawater environment, due to the high concentration of dissolved oxygen, especially chloride ions, the aluminum structures suffer from local corrosion. Therefore, if a suitable surface treatment is performed on aluminum, the service life of aluminum structures and equipment will increase significantly in corrosive environments and it will be used with more confidence [4].…”