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題名 | 氮含量與熱處理後之α相析出量對2205雙相不銹鋼耐蝕性質之影響=Effect of Nitrogen Content and σ Phase by aging Treatment on the Corrosion Resistance of 2205 Duplex Stainless Steel |
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作 者 | 王博正; 劉宏義; | 書刊名 | 鑛冶 |
卷期 | 42:4=164 1998.12[民87.12] |
頁次 | 頁73-82+72 |
分類號 | 440.365 |
關鍵詞 | 雙相不銹鋼; 氮含量; 時效熱處理; 析出相; 耐蝕性質; Duplex stainless steel; Nitrogen content; Aging reatment; σ phase; Corrosion resistance; |
語文 | 中文(Chinese) |
中文摘要 | 本研究變化不同氮含量及時效熱處理,來探討氮含量及σ相析出量對 變相不�袗�耐蝕性之影響。實驗方法包括金相定量分析,硫酸浸泡試驗、 電化學試驗及硫酸鐵/硫酸試驗。結果發現:氮含量增加會提高γ相之相比 例,且減少σ相析出量,而σ相析出量會隨時效處理時間之增長而增加, 當時效時間長達100小時,三種材料之σ相之體積為達30∼40%;另外,α 相的含量增加時,可明顯降低雙相不�袗�在硫酸中之均勻腐蝕速率,表示α d相相於γ相有較優良的耐均勻腐蝕能力;雙相不�袗�中σ相越多,均勻 腐蝕速率越增加,當σ相含量達到10%以上時,會呈現飽和的現象 )(6000mpy)。其不易受腐蝕的部分為σ相,而周圍之γ 或γ相均因伽凡尼效 應而優先腐蝕;氮含量添加會提高雙相不�袗�之Enp及Epp值,而σ相含 量增加,材料之孔蝕能力隨之下降,臨界的σ相含量在5%左右;雙 相不�袗�之σ相析出,也會發生類似敏化現象,而使材料引起沿晶腐蝕, 其主要被腐蝕組織為γ 相,而留下γ相及σ相。 |
英文摘要 | The effects of nitrogen content and σ phase by aging treatments on the corrosion resistance of 2205 duplex stainless steel (DSS) have been investigated in this study. The experimental methods included image analysis, immersion corrosion test, electrochemical test and intergranular corrosion test. The results showed that increase of nitrogen content would promote the formation of γ phase and inhibit the precipitation of σ phase. The amount of α phase would grow to 30∼40 %, when the time of aging treatment was prolonged, When the volume of σ phase increase, the general corrosion rate of DSS in sulfuric acid solution would be reduced. However, increasing σ phase deteriorated the corrosion resistance of DSS. The corrosion rate would present a saturation phenomenon (6000 mpy) when the volume of σ phase exceeded 10%. The preferential corrosion regions were rather γ and γ phases than σ phase according to galvanic effect. The addition of nitrogen would also increase Enp and Epp of DSS, but the pitting resistance would drop as the σ phase increased. The critical volume of σ phase was about 5 %. DSS, like traditioal stainless steel, would also occur sensitization owing to σ phase precipitation after long aging treatment. Therefore, γ phase was the major microstructure to be corroded resulting in the retainment of γ and σ phases. |
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