초록 ▼

◦부식거동 제어 마그네슘 소재의 합금화 및 제조공정 확립을 통해 다양한 부식환경에서 사용가능한 고내식
마그네슘 소재 제조기술을 독자적으로 확보하는 것을 목표로 연구 수행
◦합금원소 첨가를 통한 상용 마그네슘합금의 내식성 향상 방안 개발
◦AZx1-aCa-bY 합금의 표면층 및 미세조직 분석
◦조성-조직 복합제어를 통한 고내식･고인성 신합금 개발
◦Mn 첨가에 따른 Al-containing 합금 및 Al-free 합금에의 부식거동 평가
◦Ca, Y 첨가에 따른 TZ61 합금의 피막 특성 및 수소발생경향

◦부식거동 제어 마그네슘 소재의 합금화 및 제조공정 확립을 통해 다양한 부식환경에서 사용가능한 고내식
마그네슘 소재 제조기술을 독자적으로 확보하는 것을 목표로 연구 수행
◦합금원소 첨가를 통한 상용 마그네슘합금의 내식성 향상 방안 개발
◦AZx1-aCa-bY 합금의 표면층 및 미세조직 분석
◦조성-조직 복합제어를 통한 고내식･고인성 신합금 개발
◦Mn 첨가에 따른 Al-containing 합금 및 Al-free 합금에의 부식거동 평가
◦Ca, Y 첨가에 따른 TZ61 합금의 피막 특성 및 수소발생경향성 변화 평가
◦Mg-Sn계 합금의 부식거동 평가
◦열처리 유무에 따른 AZ61, TZ61 합금의 전착도장 특성 비교 평가 ◦전해액 농도, 용액온도 및 처리시간에 따른 PEO 피막 특성 변화 평가 ◦합금 조성 및 열처리 유무에 따른 상온진공분사 코팅층의 특성 변화 평가

Abstract ▼

The demand for magnesium alloys are being gradually increased due to the increase of social demand for weight reduction of transportation system. In order to satisfy the needs of automotive industry, the poor corrosion resistance of magnesium alloys should be improved dramatically. The corrosion res

The demand for magnesium alloys are being gradually increased due to the increase of social demand for weight reduction of transportation system. In order to satisfy the needs of automotive industry, the poor corrosion resistance of magnesium alloys should be improved dramatically. The corrosion resistance of magnesium alloys components is strongly dependent on the corrosion resistances of magnesium alloys and surface film. Therefore, the new
magnesium alloys with high corrosion resistance and surface treatment for high corrosion resistance and durability should be developed simultaneously to use magnesium alloys and components for a long time under various corrosive environments. The objective of this project is the development of production technology of magnesium alloys with controllable corrosion rate through the establishment of alloying and processing technologies.
In this project, to develop high-corrosion resistance Mg alloy, effect of factors such as composition, second phase, and metallurgical factors on the corrosion behaviors are researched systematically. To enhance the corrosion resistance of commercial Mg alloy,alloying elements are added to them and surface layer and microstructure of these alloys are analyzed. The change of microstructure and corrosion properties of new alloys with composition are evaluated to develop high-corrosion resistance and high-toughness Mg alloy.
Because the various factors affect properties of surface film and coating layer of electro-deposition coated alloys, the properties of electro-deposition coating with heat treatment and alloy composition are compared and evaluated. Also, the changes of properties of PEO coating film with composition, temperature and treated-time of solution are evaluated. In this project, AZ-aCa-bY alloys showed good mechanical properties and excellent corrosion resistance by controlling Ca:Y ratio. Also, the effects of factors which affected corrosion behaviors were investigated by analyzing surface layer and microstructure.
The corrosion resistance of Al-containing Mg alloys was enhanced dramatically with addition of Mn due to formation of Al-Fe-Mn phases which are less harmful to corrosion of Mg alloys. And the effects of addition of Mn to Mg alloys were changed with ratio and/or composition of alloying element. The change of corrosion behaviors of TZ series Mg alloys with addition of Ca, Y, and Mn were studied and then, properties of surface film and different tendency of hydrogen evolution in these alloys were investigated. The occurrence of pore and blistering in electro-deposited film changed with heat treatment and composition of alloying elements. These changes affected the properties of electro-deposited film. Also, the properties of PEO film of Mg alloys changed with composition of electrolyte.
The knowledges and technologies acquired through this project will be used for development of new magnesium alloys with high corrosion resistance and surface treatment technologies for film formation with high corrosion resistance and durability.