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溫壓燒結(jié)316L不銹鋼組織和耐3.5 wt. % NaCl腐蝕行為
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作者單位:

1.蘭州理工大學;2.山東科技大學;3.甘肅路橋公路投資有限公司

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國家自然科學基金(52075234，51901093)絲綢之路經(jīng)濟帶金屬表面工程技術國際科技合作基地（2017D01003）甘肅省高等學校產(chǎn)業(yè)支撐計劃項目（2020C-11），甘肅省科技重大專項（21ZD4WA017），蘭州理工大學紅柳優(yōu)秀青年人才支持計劃


Microstructure and anti-corrosion behaviors in 3.5 wt. % NaCl of warm compacted and sintered 316L
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Lanzhou?University?of?Technology

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    摘要:

    采用溫壓成形和真空燒結(jié)制備316L奧氏體不銹鋼，研究燒結(jié)溫度對材料相組織和硬度、抗拉強度等力學性能的影響，結(jié)合腐蝕失重曲線、陽極極化曲線、Nyquist圖、Mott-Schottky曲線分析研究溫壓燒結(jié)316L不銹鋼在3.5 wt. % NaCl溶液中的浸泡腐蝕行為。利用掃描和激光共聚焦電子顯微鏡分析表征拉伸斷口形貌及浸泡腐蝕形貌，X射線光電子能譜分析儀分析浸泡腐蝕600 h后的元素價態(tài)及鈍化膜成分。結(jié)果表明:115 ℃溫壓成形、1290 ℃真空燒結(jié)的316L不銹鋼密度達到最高（7.203 g/cm3），伸長率（65.46%）、抗拉強度(420.368 MPa)和硬度(63.1 HRB)最大；拉伸試樣斷口呈現(xiàn)明顯的韌性斷裂，韌窩深、數(shù)量多，韌性較好；亦在600 h浸泡腐蝕后，呈現(xiàn)最小的腐蝕電流密度(5.068×10-5 A?cm-2)和載流子密度(7.23×1019 cm-3)，最高的電荷轉(zhuǎn)移電阻(8111 Ω?cm-2)和鈍化膜電阻(14780 Ω?cm-2)，耐腐蝕性能最優(yōu)。

    Abstract:

    316L austenitic stainless steel samples were prepared by warm compacting and vacuum sintering powder metallurgy method. Effects of sintering temperature on microstructure, phase and mechanical performances such as hardness and tensile strength was investigated. And corrosion weight loss curve, anodic polarization curve, Nyquist diagram and Mott-Schottky curve were studied to investigate the immersion corrosion behaviors of the sintered 316L austenitic stainless steel in 3.5 wt. % NaCl solution. Tensile fracture，immersion corrosion morphology and passivation film composition and elemental valence was analyzed by SEM (Quanta 450 FEG), laser scanning confocal microscopy (LSM 800) and XPS (AXIS Supra) respectively. Results shown that the highest sintering density (7.203 g?cm-3),elongation(65.46%), mechanical tensile strength (420.368 MPa) and hardness (63.1 HRB) are achieved after the samples were warm compacting at 115 ℃ and vacuum sintering at 1290 ℃, and presented high toughness with the tensile fracture morphologies of ductile rupture, deep and numerous dimples. In addition, the lowest corrosion current density (5.07×10-5 A?cm-2), the carrier density (7.23×1019 cm-3), the highest charge transfer resistance (8111 Ω?cm-2) and passivation film resistance (14780 Ω?cm-2) among the sintered samples after 600 h immersion in 3.5 wt. % NaCl exhibited very good corrosion resistance.

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李文生,邢健,張杰,孫啟靜,孫永江,成波,何東青.溫壓燒結(jié)316L不銹鋼組織和耐3.5 wt. % NaCl腐蝕行為[J].稀有金屬材料與工程,2022,51(12):4714~4725.[liwensheng, xingjian, zhangjie, sunqijing, sunyongjiang, chengbo, hedongqing. Microstructure and anti-corrosion behaviors in 3.5 wt. % NaCl of warm compacted and sintered 316L[J]. Rare Metal Materials and Engineering,2022,51(12):4714~4725.]
DOI：10.12442/j. issn.1002-185X.20211000

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  • 收稿日期:2021-11-15
  • 最后修改日期:2022-02-11
  • 錄用日期:2022-02-28
  • 在線發(fā)布日期: 2023-01-19
  • 出版日期: 2022-12-30