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表面處理對鎳基合金加熱管腐蝕行為的影響

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通過動電位掃描測試、XRD分析、SEM觀察,研究了鎳基合金Incoloy800和Incoloy840鎳基合金加熱管試樣經過HNO3鈍化、涂覆SiO2膜兩種表面處理后抗腐蝕性能的變化.結果表明:鈍化處理顯著提高Incoloy840鎳基合金的點蝕電位和保護電位,而對Incoloy800鎳基合金的保護電位影響較小,幾乎沒有改變其點蝕電位;以正硅酸乙酯作為前驅體,兩種PEG表面活性劑作為模板劑,在靜電和氫鍵驅動力的共同作用下組裝生成SiO2溶膠,涂覆在鎳基合金加熱管表面形成的膜層均勻致密、性能良好;涂覆SiO2膜層顯著提高了兩種鎳基合金加熱管的自腐蝕電位和點蝕電位.上述表面處理工藝均提高了兩種鎳基合金加熱管的抗腐蝕性能. 更多還原
Observation by potentiodynamic test, XRD analysis, SEM, change of the nickel base alloy heating Incoloy800 and Incoloy840 nickel based alloy tube specimen after HNO3 passivation, coated with SiO2 film of two kinds of surface treatment corrosion performance. The results show that: the passivation treatment significantly increased the pitting potential and protection potential of Incoloy840 nickel base superalloy, and protection the potential of Incoloy800 nickel based alloy has little effect, almost no change in the pitting potential; using TEOS as precursor, two kinds of PEG surfactant as template agent, in electrostatic and hydrogen bonding force generated by SiO2 sol are assembled in the heating, coated nickel base alloy tube film formed on the surface of the uniform and dense, good performance; coated SiO2 film significantly increased two heating nickel alloy pipe corrosion potential and pitting potential. The surface treatment process was improved two kinds of nickel based alloy heating pipe corrosion performance. More reduction

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