A new method for surface modifications of carbon steels and alloys

Abstract

A three-dimensional treatment method involving implantation of ions into solids immersed in a high voltage pulse discharge ignited on the left-hand-branch of the Paschen curve was elaborated about fifteen years ago. This method, named 3DII for short, has been used in the equipment JUPITER (Joint Universal Plasma and Ion Technologies Experimental Reactor) for practical purposes. Hereafter, the need for better means to improve the metal surface protection against aggressive media prompted an elaboration of the MOSMET concept which is based on a hybrid treatment involving the processes of implantation and deposition. It is significant that the processes can be set into action simultaneously or separately. In this article, the conditions of hybrid treatment of AISI SAE 1010, 1020 y 1045 carbon steels, their subsequent electrochemical diagnostics and corrosion test results are described. The corrosion rate of the samples treated by titanium hybrid discharge is found approximately an order of magnitude smaller as compared to the non-treated samples.

Study of Concentration-depth Profiles of the Titanium and Nitrogen Ions by SRIM/TRIM Simulation

“…From the SEM photomicrograph of AISI/SAE 1020 steel surfaces in figure 4, is noticed a coating of Ti with multiple microdroplets, product of the non-ionized species (clusters formed during evaporation of the Ti cathode) and of the operating characteristics of the electric arc system implemented for evaporation of metals. Generally, the production of the microdroplets is due to the instability of the cathodic spot, which can be controlled from experimental parameters such as electric current as mentioned by Tsygankov et al [27], [31]; Mussada and Patowari [28]; Parada et al [29]; Valbuena et al [30], and Dugar-Zhabon et al [32]. 2 whose values correspond to the regions of interest (spectrum 1-3) distributed upon the substrates implanted with Ti ions.…”

Temperature behaviour on deposition of the titanium nitride thin films on the H13 steel by the electric arc discharge in vacuum

“…Substrates of a square flat geometry of 10mm in length, 10mm in width and 5mm in thickness, were designed and manufactured in AISI H13 steel [8], where one of their faces was prepared superficially with silicon carbide (SiC) abrasive paper up to grade Thin films of TiN were deposited by cathodic arc in vacuum using a Ti target, with a purity of the , and installed in the discharge chamber of the JUPITER reactor (see Figure 1), where in the normal mode of operation, the cathodes dots move through the cathode surface of the electric arc evaporator in vacuum in the spontaneous regime [9]- [11]. The TiN coating was manufactured by maintaining a pressure in the discharge chamber of the JUPITER reactor of 0.6Pa in a nitrogen atmosphere, which reacts with the titanium plasma generated by an arc current of 175A and with a polarization potential in the substrate of 20V [11]- [13].…”

“…The TiN coating was manufactured by maintaining a pressure in the discharge chamber of the JUPITER reactor of 0.6Pa in a nitrogen atmosphere, which reacts with the titanium plasma generated by an arc current of 175A and with a polarization potential in the substrate of 20V [11]- [13]. In order to improve the adhesion at the substrate-coating interface, the deposition of a titanium layer, of approximately thick, was performed.…”

“…Given the diversity of existing processes and the possible thin films that can is deposited according to their functional goal or physicalchemistry properties to enhanced, in this work a study is performed on the substrate temperature behaviour, of the AISI H13 steel, during deposition of titanium nitride thin films [8] by means of electric discharges of cathodic arc in vacuum implemented in the JUPITER device [9]- [11]. Previous studies about thin films have shown the need to identify the variables that contribute to optimizing both the formation process of these films and the improvement in their mechanical and tribological properties [11]- [15].…”

“…Previous studies about thin films have shown the need to identify the variables that contribute to optimizing both the formation process of these films and the improvement in their mechanical and tribological properties [11]- [15].…”