新聞資訊
腐蝕對高氮奧氏體不銹鋼的空蝕行為影響研究
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-12-04
利用磁致伸縮空蝕試驗機研究了高氮鋼在蒸餾水、0.5 mol/L NaCl和0.5 mol/L HCl溶液中的空蝕行為, 利用SEM觀察了試樣表面和截面的空蝕形貌, 對靜態和空蝕條件下的極化曲線進行了測量.
腐蝕對高氮奧氏體不銹鋼的空蝕行為影響研究SYNERGISTIC EFFECT OF CORROSION AND CAVITATION EROSION?OF HIGH NITROGEN STAINLESS STEEL
利用磁致伸縮空蝕試驗機研究了高氮鋼在蒸餾水、0.5 mol/L NaCl和0.5 mol/L HCl溶液中的空蝕行為, 利用SEM觀察了試樣表面和截面的空蝕形貌, 對靜態和空蝕條件下的極化曲線進行了測量. 結果表明, 高氮鋼在3種介質中空蝕8 h后的失重隨著介質的腐蝕性增加而增加, 失重率曲線存在一個孕育期, 孕育期隨著介質腐蝕性的增加而縮短; 高氮鋼的空蝕破壞以韌性斷裂為主, 在HCl溶液中, 由于H的存在, 促進了位錯的滑移, 導致裂紋失穩擴展, 裂紋擴展并相互連接造成材料的空蝕抗力降低.?
The cavitation erosion (CE) is a serious problem in engineering components in contact with a liquid?in which the press fluctuates. The CE resistance of material is related to the microstructure, hardness, work?hardening ability, superelasticity and superplasticity, or strain or stress induced phase transformation of material.?The high nitrogen stainless steel (HNSS) is attractive for its low cost in application where a combination of good?strength and toughness, high work hardening capacity, and corrosion resistance is required. These attractive?properties cause the nitrogen alloyed stainless steels to be the good candidates with relatively high CE resistance.?In this work, the CE behavior of HNSS in distilled water, 0.5 mol/L NaCl and 0.5 mol/L HCl solution was?investigated on the base of mass loss and polarization curve. The micrographs of damaged surface were observed?by using SEM. The results showed that the cumulative mass loss of HNSS after subject to CE for 8 h was the?highest in 0.5 mol/L HCl solution and lowest in distilled water. There existed an incubation period in mass loss?rate curve and the incubation period shorted with the increase of the corrosive of tested solution. The plastic?fracture was the dominant damage mode of HNSS subject to CE condition. The plastic deformation and?dislocation motion of HNSS were facilitated by diffusion of hydrogen in HCl solution, therefore the initiation and?propagation of crack are accelerated and removal of materials was accelerated by propagation and connection of?cracks.?
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