• Corrosion Science and Technology
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• 제21권1호
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• pp.1-8
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• 2022

The use of cathodic protection for metals can be achieved by sacrificial anode CP or impressed current CP, or a combination of both. Cathodic protection is a highly effective anti-corrosion technique for submerged metals or metals in soil. But because the non-immersion atmospheric automobile environment is a high resistance environment, it is limited by fundamental cathodic protection. However, the application of cathodic protection to automobiles is attractive because of the possibility of maintaining corrosion resistance while using lower-cost materials. A commercially available product for automobiles that uses both sacrificial anode CP and impressed current CP was tested in a periodic salt spray environment to investigate the performance of the devices. Experimental results show that the metal to be protected has different anti-corrosion effects depending on the distance from the anode of the device, but it is effective for the entire 120 cm long specimen exposed with one anode. The cathodic protection is effective because the conductive tape attached to the anode of the structure to be protected acts as a constant electrolyte in wet and dry conditions. The results show that the entire standard passenger car can be protected by cathodic protection with 4 anodes.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2005년도 춘계 학술기술논문발표대회 논문집
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• pp.113-117
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• 2005

The ceramic metal resin paints for waterproof and anti corrosion is not long history in development of materials even many actual result. So far, no standard have been given to construction and maintenance method, Quality and property, it is real state that cannot afford to proper quality control in job site or production. This study has been test for the ceramic metal resin paints for water and anti corrosion, as the result, it have proper performance of job site and mechanical performance of compare to other existing. In particular, tensile strength indicates more high about $14.1N/mm^2$ than epoxy resin paints, and in elongation per unit length is more high It is shows having better adhesive strength than epoxy resin paint for crack on the concrete structure. Moreover, The ceramic metal paint for water and corrosion proofing have to have main performance is watertightness and resistance for external impact, chloride ion permeation, drinkable water elution.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2014년도 추계 학술논문 발표대회
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• pp.61-62
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• 2014

To evaluate anti-corrosion performance of high-frequency arc metal spray film in accordance with metal type and epoxy sealing coat application status, electrochemical impedance spectroscopy(EIS) method was conducted in this study. As a result, in case of applying Al-Mg alloy metal spray film, it showed the best polarization resistance. In case of applying epoxy sealing coat, it showed increased polarization resistance of arc metal spray film. Through this experiment, it is judged that Al-Mg alloy arc metal spray film with epoxy sealing coat can increase the biggest anti-corrosion performance of high-frequency arc metal spray film on steel.

• Corrosion Science and Technology
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• 제12권6호
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• pp.295-303
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• 2013

Silane surface treatments have been developed as an alternative for toxic and carcinogenic chromate-based treatments for years. It is consistently observed that ultra-thin films offer excellent corrosion protection as well as paint adhesion to metals. The silane performance is comparable to, or in some cases better than, that of chromate layers. Based on the tetra-ethylorthosilicate(TEOS) and methlyl trieethoxysilane(MTES), inorganic sol was synthesized and formed hybrid networks with $SiO_2$ nano particle and polypropylene glycol(PPG) on Zn alloyed steel surface. According to SST results, addition of 10nm and 50nm $SiO_2$ nanoparticle in synthesized solution improved anti-corrosion property by its shear stress relaxation effect during curing process. Also, SST results were shown that anti-corrosive property was affected by the amounts of organic compounds.

• 보존과학회지
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• 제36권2호
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• pp.82-92
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• 2020

현대 미술작품은 재료와 제작기법, 종류가 매우 다양하게 사용되고 있으며 특히 조각작품 중 많은 비율을 차지하는 금속의 경우 형태가 다양하고 여러 재질과 혼합된 작품이 다수 존재한다. 이러한 구조적, 재료적 특성은 보존처리 시 기존의 처리 방법을 적용하기 어려운 경우가 많아 보다 다양한 처리 재료 및 방법이 요구된다. 본 연구에서는 금속 작품의 효과적인 보존처리를 위해 방청제(Rust inhibitor, 防錆劑)를 작품에 직접적으로 도포하는 방법이 아닌 기화성 방청제를 적용하였으며, 기화성 방청제 및 이를 함유한 방청필름의 방청효과를 평가하였다. 금속 시편을 대상으로 기화성 방청제를 적용한 방청처리 결과, 시편의 색도 변화는 미미하였으며, 부식 속도는 방청 미처리 시편과 비교하였을 때 절반 정도 감소하는 것을 확인하였다. 방청필름 적용 실험 결과, 방청필름 사용 시 미처리 및 폴리에틸렌 필름을 사용한 시편보다 부식화합물의 발생이 감소하였다. 접촉각 및 표면에너지, 표면전기저항 측정을 통해 표면의 물성을 측정하였으며 방청피막이 형성됨을 확인하였다. 또한 기화성 방청제 및 방청필름을 실제 조각작품에 적용하여 방청효과를 확인하였다.

• 동력기계공학회지
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• 제18권2호
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• pp.37-42
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• 2014

The purpose of this paper is to investigate polarization characteristics of heat-treated Ni-based self-flux alloy coating in alkaline solution. Ni-based self-flux alloy powder was sprayed to a steel substrate using flame spray process, and heat treatments were performed in a vacuum furnace at $800^{\circ}C$, $900^{\circ}C$, $1000^{\circ}C$ and $1100^{\circ}C$. After heat treatments, corrosion tests were carried out using potentiostat/galvanostat at solution with pH 8 and pH 13. Corrosion potential(Ecorr) and corrosion current density(Icorr) could be analyzed from polarization curve. Anticorrosive effect of heat-treated coating at solution with pH 8 was relatively greater than at solution with pH 13. Heat-treated coating at $1100^{\circ}C$ showed the greatest anti-corrosion characteristics in alkaline solution.

• Corrosion Science and Technology
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• 제10권6호
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• pp.205-211
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• 2011

The severe corrosion environment makes the steel product lifecycle short while Cu-alloys with anti-corrosion characteristic used in sea water are too expensive. This study shows that the Cu-alloy(Cu-37.25% Zn-0.67%Al) used in sea water environment can be superseded by SS400 with various coating process, evaluating electrochemical characteristics. Three coating processes were applied to SS400 such as PTFE + Zn coaing, Zn + PTFE coating and only Zn electrogalvanizing coaing. Various electrochemical experiments such as open circuit potential measurments, potentiodynamic polarization tests and analyses of Tafel constants. Mechanical properties were also measured by tensile test and hardness tests. As a result, Zn + PTFE coating for SS400 steel presented the excellent anti-corrosion characteristic in sea water.

• Corrosion Science and Technology
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• 제11권1호
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• pp.15-19
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• 2012

Both electrogalvanized and hot-dip galvanized steel sheets have been finally produced via organic-inorganic surface coating process on the zinc surface to enhance corrosion resistance and afford additional functional properties. Recently, POSCO has been developed a variety of chromate-free coated steels that are widely used in household, construction and automotive applications. New organic-inorganic hybrid coating solutions as chromate alternatives are comprised of surface modified silicate with silane coupling agent and inorganic corrosion inhibitors as an aqueous formulation. In this paper we have prepared new type of hybrid coatings and evaluated quality performances such as corrosion resistance, spot weldability, thermal tolerance, and paint adhesion property etc. The electrogalvanized steels with these coating solutions exhibit good anti-corrosion property compared to those of chromate coated steels. Detailed components composition of coating solutions and experimental results suggest that strong binding between organic-inorganic hybrid coating layer and zinc surface plays a key role in the advanced quality performances.

• 한국건설순환자원학회논문집
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• 제4권3호
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• pp.243-249
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• 2016

본 연구에서는 시멘트계 보수재 코팅이 철판의 부식 저항성에 미치는 영향을 평가하가 위해 보통 철판(Normal), 용접철판(Welding), 용접 후 보수재 철판(Welding & coating)의 세 가지 경우에 대하여 7일간 ICM(Impressed Current Method)를 통하여 부식을 촉진시켰다. 이후 Faraday 법칙을 통해 얻은 이론 부식률, 실험 부식률 그리고 부식 실험 후 측정한 휨 강도를 비교 평가하였다. Normal case와 Welding case에서는 약 70% 수준의 부식률이 측정되었으며, Welding & coating case에서는 약 17%정도의 부식률이 측정되었다. 이는 시멘트계 보수재료의 코팅이 염화물 이온의 침투를 효과적으로 차단하였으며 이로 인해 부식전류의 발생이 억제되었기 때문이다. 휨 강도 역시 부식률 평가와 같은 경향을 나타내었으며 Welding & coating case에서 Welding case 대비 약 3.4배 큰 강도가 평가되었다. 시멘트계 보수재 코팅이 용접부에 시행되면 용접부 철판의 부식 차단에 효과적일 것으로 판단된다.

• 수산해양교육연구
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• 제10권1호
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• pp.69-78
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• 1998

Thermal sprayed Cu-Ni alloy coating on the carbon steel was carried out impingement erosion-corrosion test and electrochemical corrosion test in the marine environment. The impingement erosion-corrosion behavior and electrochemical corrosion characteristics of substrate(SS400) and thermal sprayed Cu-Ni coating was investigated, and the corrosion control efficiency of Cu-Ni coating to substrate was estimated quantitatively. Main results obtained are as follows : 1) The weight loss rate of Cu-Ni coating layer by the impingement erosion-corrosion compared with substrate was smaller in high specific resistance solution than in low specific resistance solution. 2) The corrosion potential of Cu-Ni coating layer spray coating in the marine environment became more noble than that of substrate. 3) With the lapse of time, corrosion current density of Cu-Ni coating layer became stable, but that of substrate was increased. 4) As the corrosion control efficiency of Cu-Ni coating layer in the marine environment was over 90%, its anti-corrosion characteristics was excellent.