| 摘要: |
| 针对导致奥氏体合金涂层腐蚀发生及发展的腐蚀原电池问题和晶间贫铬问题，通过选择镍铬基材料，添加助熔成分硅和形核稀士元素等以及防铬元素偏析成分，采用熔化氩气干雾化工艺，研制出一种新型粉体喷涂材料。采用超音速火焰喷涂方法，利用其“骤冷”热处理特点，提高冷却速度细化晶粒，制备出微晶态镍铬基耐蚀合金涂层。经金相分析、能谱成分分析和X射线衍射（XRD）证明涂层存在微晶且该涂层元素分布均匀，无成分偏析现象。经热分析、硬度检测、海水浸泡电化学腐蚀检测等试验证明，该涂层在786.6 ℃的相变温度以下性质稳定，硬度高达300 HV，耐蚀性能好，为海洋环境钢铁构件防腐蚀提供了一种耐蚀、耐磨的长效保护涂层。 |
| 关键词: 超音速火焰喷涂 微晶 镍基合金 |
| DOI：10.3969/j.issn.1007-9289.2014.04.004 |
| 分类号: |
| 基金项目: |
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| Microcrystal Nickel-based Corrosion-resistant Alloy Coating Prepared by High Velocity Oxygen Fuel |
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MA Qinghua
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Navy Equipment Technique Institute, Beijing 102442
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| Abstract: |
| According to the existent problem of corrosioncell and poor chromium between crystal lattice inducing austenite alloy corrosion, a newtype spraying powder alloy was processed by argon dryatomizing techniques with adding fusing assistant element Si, nucleating rare earth element, and chromium segregation preventive to NiCr based material. The microcrystal and corrosion resistant NiCr based alloy is prepared by high velocity oxygen fuel (HVOF) technique, which is a quenching treatment and induces refine the grain by enhancing the cooling rate. The results show that the coating is amorphous or microcrystal and element uniform distribution, through metallurgical, energy dispersive spectrometer (EDS) and Xray diffraction (XRD) analysis. The coating shows steady properties under 786.6 ℃, with good corrosionresistance and high hardness of 300 HV, through thermal analysis, rigidity analysis and seawaterimmersion test, which provide a longacting protection of corrosion resistance and abrasive resistance for steel in the marine environment. |
| Key words: high velocity oxygen fuel (HVOF) microcrystal NiCr based alloy |
