第二燐酸망간鹽 水化物의 새로운 合成法 및 表面調整 效果

다국어 초록 (Multilingual Abstract)

Manganese hydrogen phosphate hydrate, MnHPO4·E2.25H2O, is a major constituent of the pre-conditioning compositions for the manganese phosphate coating treatment over carbon steel substrate.
This compound is conventionally produced by synthesis in the aqueous solution process followed by the filtration, drying and a series of size reduction and classification processes in dry state. However, it is evident that the conventional process is neither environment-friendly nor cost-effective. Controlled double-jet precipitation process was engineered to manufacture expensive particles of photographic chemicals, and has recently been applied to various particles of submicron or micron size. In this work, a new process principle was examined based on the controlled double-jet precipitation technology to produce the manganese chemical product of fairly uniform particle size distribution in an aqueous solution medium. The effects of stabilizing agents were comparatively studied by the scanning electron microscope analysis in a uniformity point of view of the resulting particle size. Polyvinyl pyrrolidone and Gum Arabic were excellent in controlling the crystal growth step, resulting in fairly uniform particle size distributions of manganese hydrogen phosphate hydrate from the controlled double-jet process. The surface-conditioning effects were examined in the manganese phosphate coatings over carbon steel substrate by applying the pre-conditioning particles produced in the conventional way and by the new process based on controlled double-jet precipitation. The phosphate coatings were compared in morphology and in a mono-dispersity point of view. Manganese hydrogen phosphate hydrate by controlled double-jet precipitation with polyvinyl pyrrolidone was concluded excellent to coat uniform crystalline manganese phosphate onto the substrate.

목차 (Table of Contents)

• 1. 서론 1
• 2. 실험 5
• 2.1. 시약 및 합성 원료용액의 제조 5
• 2.2. 실험 방법 7
• 2.2.1. 더블제트를 이용한 합성 7
• 2.2.2. 인산 피막화 실험 11
• 2.3. 분석 방법 13
• 3. 결과 및 고찰 14
• 3.1. 더블제트를 이용한 망간염의 합성 14
• 3.1.1. 더블제트 합성 기초 실험 14
• 3.1.2. 안정화제를 적용한 더블제트 합성 실험 22
• 3.2. 인산 피막 43
• 4. 결론 47
• 참고문헌 49
• ABSTRACT 51