• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.18 no.10
• /
• pp.603-610
• /
• 2017

Steel used for various industrial fields including ammunition is vulnerable to corrosion so surface treatments are required such as plating, painting and chemical conversion coating. Zinc phosphate, used for ammunition manufacturing, is used to stick the stable compound on the surface by chemical conversion of metal. The quality of phosphate coating depends on many factors such as total acidity and iron content. In this study, we studied the influence of total acidity and iron content on coating weight and corrosion resistance of phosphate coating. The surface structure of the coating becomes dense and corrosion resistance is improved with increasing iron content. However, total acidity influences only the thickness and phosphate coating weight. In conclusion, this study suggests the optimal range of total acidity and iron content to manufacture the ammunition.

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2012.05a
• /
• pp.264-264
• /
• 2012

Zn-Mg 합금도금의 인산염 처리시 산성의 인산염 용액에 의해 도금층으로부터 용출된 마그네슘이온은 인산염 결정 형성에 참여하고, 이로인해 미세하고 치밀한 인산염 피막이 형성되었다. 마그네슘을 포함함 치밀한 인산염 피막은 우수한 내식성을 보였다. 마그네슘이온의 영향성 파악을 위해 인산염 용액내 추가적으로 마그네슘 이온을 투입하였으며, 마그네슘 함량증가에 따라 인산염 피막의 내식성이 향상됨을 확인하였다.

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2009.10a
• /
• pp.149-149
• /
• 2009

도막의 밀착성 및 내식성 향상을 위하여 인산염처리가 주로 이용되고 있다. 인산염피막은 결정구조로 되어있어 피막사이에 핀홀이 존재하여 일부 특성을 저하하기도 한다. 인산피막의 특성 향상을 위해 실란화합물에 대한 효과를 조사하였다.

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2013.05a
• /
• pp.149-149
• /
• 2013

본 연구에서는 선박, 자동차 및 가전 제품용 표면처리 강재 및 아연도금 소재를 대상으로 외관도장의 특성향상 방안에 대하여 검토하였다. 특히, 도장의 밀착성과 내충격성 향상을 위하여 제품의 소재특성으로부터 물리적 화학적 전처리와 인산염 피막처리 및 최종도장에 이르기까지 각 공정이 도장 특성에 미치는 영향을 분석하였다. 각 공정조건에 따라 처리한 도장특성 평가 결과에 의하면, 인산염 피막의 균일-미세한 분포가 도장의 밀착성과 내충격성 향상에 주요한 영향을 미친 것으로 확인되었다.

• Journal of the Korean institute of surface engineering
• /
• v.13 no.4
• /
• pp.228-243
• /
• 1980

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 1998.11a
• /
• pp.7-7
• /
• 1998

• Proceedings of the KWS Conference
• /
• 2004.05a
• /
• pp.154-155
• /
• 2004

표면처리강판은 내식성을 향상시키기 위하여 도금층위에 크로메이트 혹은 인산염처리를 행하고 있다. 크로메이트 처리는 Cr 피막 자체의 배리어특성과 피막에 함유되어 있는 Cr$^{+}$ 6 에 의한 자가보수성에 의하여 내부식성을 나타낸다. (중략)

• Journal of the Korean Magnetics Society
• /
• v.15 no.5
• /
• pp.270-275
• /
• 2005

Dust cores (compressed powder cores) of $Fe-6.0wt\%Si$ alloy with a size of $35\~180\;{\mu}m$ in diameter have been prepared by phosphate coatings and annealings at $600\~900^{\circ}C$ for 1 h in nitrogen atmosphere. Further the magnetic and mechanical properties of the powder cores were investigated. As a general trends, the compressive strength and core loss decreased with the increase in annealing temperature. When annealed at $800^{\circ}C$, the compressive strength was 15 kgf, the permeability and quality factor were 74 and 26, respectively. Moreover the core loss at 50 kHz and 0.1 T induction was $750\;mW/cm^3$, and the percent permeability under the static field of 50 Oe was estimated to be about 78. In addition, the cut-off frequency in the cure representing the frequency dependence of effective permeability was measured to be around 200 kHz. These properties of the $Fe-6.0wt\%Si$ alloy dust cores could be considered to be due to the good insulation effect of iron-phosphate coats, the decrease in magnetocrystalline anisotropy and saturation magnetostriction and the increase in electric resistivity.

• Proceedings of the Korean Environmental Sciences Society Conference
• /
• 2004.05a
• /
• pp.399-400
• /
• 2004

ZrO용액으로 코팅한 시편들의 염수분무시험에 의한 백청과 적청의 초기 발생시간으로 내식성을 평가한 결과를 토대로 정리해 보면 인산염강판에 ZrO를 단독으로 처리하는 경우에는 ZrO피막에서의 균열로 인하여 처리하지 않은 인산염처리 소재강판의 내식성보다 약간 증대하는 경향을 보였고, ZrO/BTSE를 복합 처리한 시편에서는 ZrO의 균열 틈새를 BTSE로 채워짐으로서 내식성이 개선되었으며 수지를 부가적으로 처리함으로 내식성이 월등히 향상되는 것으로 나타났다.

• Journal of Conservation Science
• /
• v.33 no.5
• /
• pp.381-390
• /
• 2017

Desalination is the main focus of the stabilization of iron artifacts. However, drawbacks such as re-corrosion are noted due to the uncertainty in the elimination of the corrosive factors and artifacts. Several studies have been carried out on the effects of corrosion inhibitors to overcome these shortcomings. In this study, the effects of type 3 water treatment on corrosion inhibitors were investigated. Surfaces of samples that contained film corrosion inhibitors on their surfaces were analyzed. The results revealed that the surface rust was removed from the sample of type 1 No. 2 that was mainly composed of phosphate. The average weight reduction rates of re-corrosion samples were 0.58, 0.03, and 0.07% for type 1 No. 2, type 2 No. 2, and type 3 No. 2 respectively. The changes in the $Cl^-$ ion, a corrosive agent were found to be 28.60, -4.08, and -1.94 ppm for type 1 No. 2, type 2 No. 2, and type 3 No. 2 respectively. The water-treated films were analyzed by X-ray photoelectron spectroscopy (XPS). It was found that type 2 No. 2 had less Fe the basis metal, than that in type 3 No. 2 indicating much better film. Moreover, Si content was higher in type 2 No. 2, based on the silicate content, than in type 3 No. 2. They are speculated to be the reason or the formation of a better film. Type 1 No. 2, which is mainly composed of phosphate, would be inappropriate as a metal artifact conservation treatment. It was determined that type 2 No. 2 and type 3 No. 2 water treatments, which are mainly composed of silicate, provided excellent corrosion inhibiting effects. Corrosion inhibitors could be used as emergency treatment agents during the excavation of iron artifacts.