• Title/Summary/Keyword: steel plating

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Characterizations of Cr-P-PTFE composite coatings electroplated from trivalent chromium-based bath

  • Park, Jong-Kyu;Byoun, Young-Min;Seo, Sun-Kyo;Park, Su-Young;Choi, Sun-Woo
    • Journal of Ceramic Processing Research
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    • v.19 no.6
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    • pp.455-460
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    • 2018
  • Chromium plating is a common surface treatment technique extensively applied in industry due its excellent properties which include substantial hardness, abrasion resistance, corrosion resistance, surface color, and luster. In this study, the effect of PTFE on corrosion behavior of Cr-P plating, low carbon steel substrates are electroplated in Cr(III) baths without and with PTFE. Trivalent chromium carbon plating was electroplated from trivalent chromium sulfate-based baths with different PTFE dispersion contents. The study focused on the microstructure, PTFE content, roughness, and corrosion resistance of the Cr-P-PTFE composite plating. Scanning electron microscopy and atomic force microscopy images showed a smoother plating and a decrease in the surface roughness of the electrodeposited. The results demonstrate that PTFE eliminates the cracks within plating by reducing internal stress. Therefore, the corrosion resistance of Cr-P-PTFE composite platings were better than that of Cr-P alloy platings.

Wear Behavior of TiN Coatings Deposited on High Speed Steel and Alloy Tool Steel (TiN 코팅된 고속도강과 합금공구강의 마멸거동)

  • 김석삼;서창민;박준목
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.3
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    • pp.705-712
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    • 1995
  • The wear characteristics and wear mechanisms in TiN coating deposited on high speed steel and alloy tool steel by ion plating were investigated. Pin on V-block wear tester was used for a wear test method. The specimen was composed of three kinds of high speed steel and alloy tool steel which had different hardness by changing the heat treating condition. Three kinds of coating thickness were also applied to each specimen. Microscopic observation of worn surfaces was made by SEM. The scratch test of coating surface by the ion plating showed that critical load to break the coating interface was greater than 50N. The critical load increased with both substrate hardness and coating thickness. The wear resistance of TiN coated high speed steel became 10 times greater than that of non-coated ones. SEM observation showed that leading edge of contact was compressive and trailing edge was under maximum tensile stress and then surface cracking broke out perpendicular to sliding direction.

DISCOLORATION AND CORROSION RESISTANCE OF TiN-COATED ORTHODONTIC APPLIANCES PRODUCED BY ION-PLATING METHOD (Ion-plating법에 의하여 TiN 피막처리된 교정용 장치물의 변색성 및 내식성)

  • Kim, Jin-Hee;Kwon, Oh-Won;Choi, Young-Yun
    • The korean journal of orthodontics
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    • v.23 no.3 s.42
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    • pp.327-340
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    • 1993
  • The purpose of this study was to estimate the possibility of practical application of TiN ion-plating method on orthodontic appliances. TiN was coated on the surface of orthodontic stainless steel roll band by means of ion-plating method, and colorimetric properties of its obtained TiN film were investigated by using color analyzer. Also its corrosion and discoloration properties were compared with those of non ion-plated stainless steel roll band by using immersion test, which was done in 1N HCl solution for 10 days. Both weight changes and surface corrosion appearances of specimens for each day were respectively investigated by using electronic weighing machine and SEM(Scanning Electron Microscope). The discoloration degress of TiN-coated specimens immersed in 1N HCl solution were investigated by using color analyzer and then judged by N.B.S.(National Bureau of Standard) Unit. The results of this study were summarized as follows. o TiN ion-plated films showed the hue of 5Y, the value of 7, and the chroma of 3 by Munsell notations. o The weight losses and surface changes of TiN ion-plated specimens immersed in 1N HCl solution were less than those of non ion-plated specimens. It was shown, therefore, that the corrosion resistance was significantly improved by TiN ion-plating. o The discoloration degrees of non ion-plated specimens were too significant to be examined by color analyzer, while those of TiN ion-plated specimens were slight when judged by N.B.S. Unit. It was also apparent, therefore, that the anti-discoloration property was significantly improved by TiN ion-plating.

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Effect of Nitrogen Gas Pressure on the Property of TiN-Coated Layer of High Speed Steel by Arc ion Plating (AIP 법에서 질소가스 압력이 고속도강의 TiN 코팅층 성질에 미치는 영향)

  • Kim, Hae-Ji;Joun, Man-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.7
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    • pp.124-130
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    • 2008
  • The effect of nitrogen gas pressure in arc ion plating on surface properties of the TiN-coated high speed steel(SKH51) is presented in this paper. The surface roughness, micro-particle, micro-hardness, coated thickness, atomic distribution of TiN, and adhesion strength are measured fur various nitrogen gas pressures. It has been shown that the nitrogen gas pressure has a considerable effect on the surface roughness, adhesion strength, atomic distribution of TiN, and surface deposition of TiN of the high speed steels but that it has little influence on the micro-hardness and coated thickness.

Experimental Study on Effect of Furnace Temperature on TiN-Coating by Arc Ion Plating (AIP 코팅법에서 로의 온도가 TiN 코팅에 미치는 영향에 관한 실험적 연구)

  • Kim H. J.;Lee S. W.;Joun M. S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2005.05a
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    • pp.401-406
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    • 2005
  • In this paper, both effect of TiN-coating and effect of temperature in TiN-coating by arc ion plating on surface characteristics of TiN coated SKH51 steel are investigated by experiments. Hardness, surface roughness, TiN coating thickness and adsorption force are measured in order to evaluate the effects. For evaluation of the experimental data, the two-way ANOVA method is used. It is concluded that the furnace temperature in the rang of $400^{\circ}C\~500^{\circ}C$ in AIP processing has very little influence on the TiN coating of the SKH51 steels.

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Characteristic Evaluation According to the Surface Treatment Method of SKD61 Mold Steel for Aluminum Casting (알루미늄 주조용 SKD61 금형강의 표면처리 방법에 따른 특성 평가)

  • Choi, Se-Weon;Kim, Cheol-Woo;Kim, Yong-Ho;Yoo, Hyo-Sang
    • Journal of the Korean Society for Heat Treatment
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    • v.34 no.6
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    • pp.281-286
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    • 2021
  • Arc ion plating (AIP), laser cladding, and nitriding are methods that can prevent mold damage or repair and create cracks and breakages on the die surface. The dissolution and soldering behavior of coated SKD61 by using arc ion plating, laser cladding, and nitriding was investigated. The structure of the coating was investigated as a function of deposition conditions by X-ray diffraction and the crystallographic orientation was determined using the texture factor. The TiAlN film deposited with AIP showed excellent corrosion resistance in the molten aluminum alloy at 680℃. In this paper, we have detailed the corrosion and mass loss phenomena associated with these steel-cast metal interactions.

Power Electronics Application in the Steel Industries -Induction Heating Equipment- (철강산업에서의 전력전자 기술응용-유도가열장비)

  • Shim, Eun-Yong;Yoo, Hyo-Yol;Kang, Jae-Bong
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.12-14
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    • 2008
  • We have been trying to do our every efforts in various division in order to get more highly competition of products in steel industry, Especially, for the industry of cold mill, We are making high degree durability & elegant of steel plate from high quality plating & coating. Recently, Induction heating equipments are used to be choose in order to heat the steel plate in processing of drying and of curing after plating and coating are done. This paper will describe the theory of induction heating, consideration matters to decide power supply, structure of heating coil & manufacturing, operating methods etc, also it will present installation reference.

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The Investigation of Microstructure of Electro-deposited Layer for the Corrosion Resistance on Sheet Steel (강판의 부식방지를 위한 도금층 조직관찰)

  • 김인수;이세광
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1997.10a
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    • pp.224-227
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    • 1997
  • In Ni and Zn plating, microstructure and corrosion behavior of electrodeposits with various electroplating condition were investigated. Optical microstructure, SEM images and polarization curves of electrodeposits are different with plating time and temperature.

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Sliding Contact Analysis between Chromium Plated Hydraulic Cylinder Rod and Seals (크롬 도금한 유압 실린더 로드와 시일 사이의 미끄럼접촉 해석)

  • Park, Tae Jo;Kim, Min Gyu
    • Journal of Drive and Control
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    • v.15 no.1
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    • pp.10-15
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    • 2018
  • The hydraulic cylinder seals are used not only to protect leakage of the working fluids but also to prevent incoming of foreign particles into the system. Chromium plating is generally applied to improve corrosion and wear resistance. It has been noticed that sealing surface damage occurs due to the hard foreign/wear particles contained in the hydraulic oil. In this study, a three-bodied sliding contact problem related with a PTFE seal, a spherical particle and chrome-plated steel substrate is modeled to investigate the relations to wear mechanism. Using the nonlinear finite element software, MARC/MENTAT, the deformed shapes, the von Mises and first principal stress distributions with plating thickness were compared. The sealing surface was mainly abraded by hard particles embedded in the seal. The plastic deformation of the steel substrate decreased with thicker plating. Hence it could be more effective to coat the sealing surface of a hydraulic cylinder with a hard material such as TiN, TiC and DLC.

Retrofitting by adhesive bonding steel plates to the sides of R.C. beams. Part 1: Debonding of plates due to flexure

  • Oehlers, Deric. J.;Nguyen, Ninh T.;Bradford, Mark A.
    • Structural Engineering and Mechanics
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    • v.9 no.5
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    • pp.491-504
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    • 2000
  • A convenient method for enhancing the strength and stiffness of existing reinforced concrete beams is to bond adhesively steel plates to their tension faces. However, there is a limit to the applicability of tension face plating as the tension face plates are prone to premature debonding and, furthermore, the addition of the plate reduces the ductility of the beam. An alternative approach to tension face plating is to bond adhesively steel plates to the sides of reinforced concrete beams, as side plates are less prone to debonding and can allow the beam to remain ductile. Debonding at the ends of the side plates due to flexural forces, that is flexural peeling, is studied in this paper. A fundamental mathematical model for flexural peeling is developed, which is calibrated experimentally to produce design rules for preventing premature debonding of the plate-ends due to flexural forces. In the companion paper, the effect of shear forces on flexural peeling is quantified to produce design rules that are applied to the strengthening and stiffening of continuous reinforced concrete beams.