용융 아연에 의한 합금강의 침식현상에 관하여 (Ⅰ)

Abstract

본 실험은 용융 아연 도금용 도금조의 재료로서 경제적이면서도 가장 내식성이 우수한 재료를 개발하기 위하여, 우선 stainless steel(AISI 304)를 이용하여 용융아연과의 반응성 정도늘 450℃-600℃의 온도 범위내에서 정량적으로 측정하였으며, 아울러 반응 mechanism도 규명하여 보았다. 그 결론은 다음과 같다.

1. 용융아연에 의한 stainless steel의 단위면적당 침식량(w)은 시간(t)의 제곱근에 비례한다.

2. 용융 아연에 의한 tainless steel의 단위면적당 침식량은 mild steel에 비하여 1/3-1/2이상 적음을 알 수 있었다.

3. 용융 아연에 의한 stainless steel(ASI 304)의 침식반응은 530℃를 경계로 하여 그 이하의 온도에서는 diffusion controlled process이며 그 이상의 온도에서는 surface controlled process로서 이때 각각의 반응에 요하는 activation energy는 각각 4Kal/mole 및 10Dcal/mole이다.

4. Calvanizing tank 용 재료로서 stainless steel(AISI 304) 이 mild steel 보다 훨씬 우수하다.

To develope a materials for galvanizing tank which is not only economical but corrosion-resistent this study first adopted stainless steel (AISI 304) as its material and measured quantitatively the degree which stainless steel reacts with molten zinc under the temperature between 450℃ and 600℃. This study also tried to explain its reaction mechainism.

The followings are the conclusions er obtained.

1. The dissolved amount of stainless steel by molten zinc for a unit area was in proportional to the square root of the reaction time.

2. The dissovled amount of stainless steel was found to be a half or one-third of that of mild steel.

3. The mechanisms of the corrosion rections of stainless steel by molten zinc were diffusion controlled process below 530℃ and surface controlled porcess between 530℃ to 600℃; the acivation energies required to activate both reactions were 4Kcal/mole and 10Kcal/mole respectively.

4. As a material for a galvanizing tank, stainless steel was found to be much supeior to mild steel.

To develope a materials for galvanizing tank which is not only economical but corrosion-resistent this study first adopted stainless steel (AISI 304) as its material and measured quantitatively the degree which stainless steel reacts with molten zinc under the temperature between 450℃ and 600℃. This study also tried to explain its reaction mechainism.

The followings are the conclusions er obtained.

1. The dissolved amount of stainless steel by molten zinc for a unit area was in proportional to the square root of the reaction time.

2. The dissovled amount of stainless steel was found to be a half or one-third of that of mild steel.

3. The mechanisms of the corrosion rections of stainless steel by molten zinc were diffusion controlled process below 530℃ and surface controlled porcess between 530℃ to 600℃; the acivation energies required to activate both reactions were 4Kcal/mole and 10Kcal/mole respectively.

4. As a material for a galvanizing tank, stainless steel was found to be much supeior to mild steel.