• 제목/요약/키워드: Iron surface

검색결과 1,097건 처리시간 0.027초

용사법에 의한 주철제 표면개질부의 내마모성 연구 (A study on the anti-wear properties of surface modified cast iron by metal spray method)

  • 이광렬;최영국;김영식
    • 한국해양공학회:학술대회논문집
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    • 한국해양공학회 2002년도 추계학술대회 논문집
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    • pp.312-317
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    • 2002
  • A experimental try was conducted for the purpose of establishment of the cast iron modification by the metal spray method. The friction and wear resistance properties of the metal sprayed cast iron surface were evaluated. The application experiment for the cast iron modification by the metal spray method was conducted in order to develope the restoring method of the scrapped cast iron cylinder liner of the marine engine.

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저압가스질화에서 탄소강의 초기 화합물층 형성 거동 (Behavior of Initial Formation of Iron Nitride on Carbon Steel at Low Pressure Gas Nitriding)

  • 김윤기;김상권
    • 한국표면공학회지
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    • 제44권3호
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    • pp.75-81
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    • 2011
  • Growth behaviors of iron-nitride on S45C steels at low pressure gas nitriding were examined. Surfaces of the steels covered with fine and porous oxide during the pre-oxidation using $N_2O$ gas. Well faceted particles connected with them were observed after 1 min nitriding. They grew steadily and filled inter-pores during additional nitriding process. From the X-ray diffraction analysis, ${\gamma}'$-iron nitride was dominantly formed at the initial stage but the amount of ${\varepsilon}$-iron nitride was rapidly increased as nitriding treatment time. The porous layer was formed on the particles and thickened up to half of nitride layer after 60 min nitriding. The observed growth behaviors were discussed in internal stress related with volume expansion involved in transforming from iron to iron-nitrides.

Zn-Fe합금전기도금강판의 마찰특성 (Frictional Characteristics of Zn-Fe Alloy Electroplated Steel Sheets)

  • 김영근;김명수
    • 한국표면공학회지
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    • 제28권1호
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    • pp.14-22
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    • 1995
  • The effects of iron content in coated layer, surface roughness and lubricants on the formability of commercial Zn-Fe alloy electroplated steel sheets used for automotive bodies were investigated. The higher the iron content in deposit, the lower the friction coefficient of Zn-Fe alloy electroplated steel sheets. The surface roughness of coated layer hardly influenced the frictional characteristics. The formability of Zn-Fe alloy electroplated steel sheets was found to be more affected by the lubricant than by iron content in Zn-Fe alloy electrodeposit.

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철산화물의 합성 및 이를 이용한 비소의 흡착제거 (Synthesis of Iron Oxide and Adsorption of Arsenic on Iron Oxide)

  • 김연정;최식영;김영훈
    • 한국환경과학회지
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    • 제28권1호
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    • pp.99-106
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    • 2019
  • Arsenic is among the heavy metals commonly found in aqueous environments. Iron oxide is known as an efficient adsorbent for the arsenic. A new synthetic method was applied to provide iron oxide giving a large specific surface area. The mixing method affects the formation of iron oxide. Ultrasonic waves assisted the formation of very fine iron oxide in an organic phase. The synthesized iron oxide is amorphous type with a high surface area of more than $181.3m^2/g$. Sorption capacity of the synthesized adsorbent was relatively very high for arsenic and varied depending on the oxidation state of arsenic: a higher capacity was obtained with As(V). Lower solution pH provided a higher sorption capacity for As(V). The competitive effect of co-exist anions such as chloride, nitrate, and sulfate was minimal in sorption capacity of the iron oxide for arsenic.

강재의 마그네타이트 피복에 관한 연구 (Magnetite film on iron)

  • 김헌규;강탁
    • 한국표면공학회지
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    • 제25권2호
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    • pp.66-72
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    • 1992
  • Magnetite film on iron surface could be coated in strongly alkaline solution (12M NaH\OH) which contained additives such as NaHCO3, KCl and NaNO2, Iron plate was immersed in boiling solution ($130^{\circ}C$) contained above mentioned additives for 1 hour. There are some microcracks and these cracks proved to be the sites for the initiation of corrosion when immersed in 3% NaCl solution. To improve corrosion resistance of the coated steel plate, chromating was done as a post treatment. Chromate film was formed on magnetite oxide film potentiostatically at-918mV/SCE for five minutes at temperature of $70^{\circ}C$ in the alkaline solution containing 5g/l Na2Cr2O7.2H2O.Cr3O4 was electrodeposited on magnetite oxide film and Cr2O3 was electrodeposited on iron surface which was assumed as surface revealed due to microcracks. Increased corrosion resistance of chromated magnetite oxide film was proved in salt spray test & immersion test.

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Si함유강의 용융아연 도금부착성에 미치는 산화-환원 열처리 영향 (Effect of oxidation-Reduction Hating Conditions on Coating Adherence of Hot-Dip Galvanized Steel Containing silicon)

  • 김종상
    • 한국표면공학회지
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    • 제31권2호
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    • pp.101-108
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    • 1998
  • The effect of oxidation-reduction heating conditions on coating adherence of hot-dip galvanized steel containing silicon has beeninvestigated. The presence of a stbke sillicon oxide formed on the steel surface has been shown to be very detrimenal to proper wetting by liquid zinc. When the steel has more than the critical sillicon content neeled to from a stable external oxide, the use of oxidation-reduction method has been found successful in obtaining a good quality, coated product with excellence adhreence. This can be explained by the formation of an iron oxide. The iron oxrtion of the scale is reduced, leaving the stable oxides dispersed in a fresh metallic iron surface layer. This reduced iron surface is easily wetted by the liquid zinc and excellent adherence is obtained.

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영상처리를 이용한 용선시편의 표면결함 검사방법 (Surface Defect Inspection Method of Iron Samples using Image Processing)

  • 안현식;정규원;김정하
    • 한국정밀공학회지
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    • 제12권10호
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    • pp.78-88
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    • 1995
  • For producing iron or steel products with good quality, the concentration of the material components should be analyzed quickly with high relability using XRF(Fluorescent X-Ray Spectrometer). Since the analysis results are much dependent upon the surface con- dition, the samples have to be prepared to have good test condition. This study presents an image processing system for inspecting the surface condition of the iron test sample. In order to use thd computer vision system, we need to develop a lighting device and image processing algorithm. For the adequate lighting device of inspection system, the indirect lighting device is contrived to cut the external light and provide uniform, stable and cold light. The image processing algorithm is aimed to reduce inspection time and to get similar analyzing results to those of the experienced operators. At first, the image processing algorithm checks whether the surface of the iron sample is ground well or not. Then, the defects; hole or dig are conted and surface condition is evaluated. In addition, the algorithm gives the reliability of the analyzing results in order to help operator's decision.

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스테인리스강-주철 이중복합관의 제조개발에 관한 연구 (Fabrication Development of Stainless Steel - cast Iron Dual Tube)

  • 최상호;강춘식
    • 한국주조공학회지
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    • 제8권4호
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    • pp.429-436
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    • 1988
  • The influences of some casting conditions on bonding ratio and state at bonding zone of stainless steel-cast iron dual tube produced by centrifugal casting process were investigated to estimate fabrication technics. 1) Bonding ratio is increasing such as increasing of inner surface temperature of outer metal(stainless steel STS 304), if pouring temperature of inner metal (cast iron) is constant. 2) The more pouring temperature of inner metal (cast iron) increase, the more bonding ratio increase when inner surface temperature of outer metal (cast iron) is constant. 3) As the mold rotary speed is increase, the hatching area of bonding map (perfect bonding area) goes down to the low pouring temperature of inner metal. 4) In order to predict bonding state of two different metal, we are able to make and use the bonding map about casting conditions such as inner surface temperature of outer metal, pouring temperature of inner metal and mold rotary speed.

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비철금속의 선삭에서 절삭각과 이송량이 표면거칠기에 미치는 영향에 관한 연구 (Study of Surface Roughness by Feedrate and Cutting Angle at Turning of Non-iron Metal)

  • 전재억;정진서;김수광;권혁친;하만경
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 추계학술대회 논문집
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    • pp.884-887
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    • 2000
  • In the present industry, there is not only the cutting of iron metal, but also the cutting of alloy aluminum, brass and plastic to wood(Paulownia). A variety of material is used and these industry is made need of the cutting material but lots of experiments processing is not enough at the moment. At this point, our team processed the basic experiment about influencing of Feedrate and Backrake angle of bite concerned to manufacture in the turning of non-iron metal. Generally speaking, we recognized that there was occurrence of increase of Surface Roughness with increasing of cutting angle in the non-iron metal, but in the cutting of wood we knew, there was special change with change of cutting angle

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반응표면분석에 의한 고 Cr 철계 오버레이 용접부의 분체침식마모 특성의 연구 (A Study on Solid Particle Erosion Wear Characteristics of High Cr White Iron Hardfacing by Response Surface Method)

  • 이형근
    • Journal of Welding and Joining
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    • 제20권4호
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    • pp.551-556
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    • 2002
  • Solid particle erosion wear characteristics of high Cr white iron hardfacing were investigated using the erosion wear test method according with the ASTM G76-95. Wear experiments, where the blast angle, blast distance and blast pressure were selected as test variables, were planned and analyzed by response surface method (RSM to evaluate the wear loss statistically and quantitatively. The measured wear losses well coincided with the calculated ones by the experimental equation. The wear loss of high Cr cast iron hardfacing was increased with blasting pressure, but affected in a complicated way by the blasting angle and distance. Erosion wear of high Cr cast iron hardfacing could be well predicted by RSM analysis of wear variables.