發(fā)布時(shí)間：2018-04-28 15:35

  本文選題：鎳鋁青銅 + 冷噴涂��； 參考：《工程科學(xué)學(xué)報(bào)》2017年07期

【摘要】：鎳鋁青銅合金是鑄造大型艦艇螺旋槳的主要材料,海洋污損生物在合金表面附著引起的pH值變化會(huì)加速鎳鋁青銅合金的腐蝕磨損,威脅到艦艇安全航行.采用冷噴涂技術(shù)制備了較為致密的鎳鋁青銅涂層,厚度約300μm,利用掃描電鏡、光學(xué)顯微鏡觀察了涂層的微觀形貌,重點(diǎn)研究了涂層在pH值分別為3、7和11,質(zhì)量分?jǐn)?shù)為3.5%的Na Cl溶液中的電化學(xué)腐蝕性能和腐蝕磨損行為.實(shí)驗(yàn)結(jié)果表明:pH值為3的環(huán)境中,鎳鋁青銅基體發(fā)生了選相腐蝕,表面疲勞裂紋主要分布在富Cu的α相上,涂層上的犁削溝槽加深發(fā)生了磨粒磨損,涂層耐腐蝕性能優(yōu)于基體;pH值為7的環(huán)境中,基體發(fā)生了黏著磨損,表面有片層狀金屬剝落,涂層中的孔隙收容了大量磨屑避免了劇烈的三體摩擦,表面犁削溝槽較淺,涂層致鈍電位高于基體,耐腐蝕性能變差.pH值為11的環(huán)境中,基體發(fā)生了表面疲勞磨損,涂層磨痕上有較深的犁削溝槽,溝槽內(nèi)有微裂紋,涂層耐腐蝕性能優(yōu)于基體.總體來說,在不同pH值環(huán)境中,涂層由于在冷噴涂過程中發(fā)生了冷加工硬化并且涂層上的孔隙收容了磨屑,導(dǎo)致涂層的耐腐蝕磨損性能增強(qiáng).
[Abstract]:Nickel aluminum bronze alloy is the main material for casting large ship propeller. The change of pH value caused by the adhesion of marine fouling organisms on the alloy surface will accelerate the corrosion and wear of nickel aluminum bronze alloy and threaten the safe navigation of the ship. A dense Ni-Al bronze coating with a thickness of about 300 渭 m was prepared by cold spraying technique. The microstructure of the coating was observed by scanning electron microscope and optical microscope. The electrochemical corrosion behavior and corrosion wear behavior of the coating in NaCl solution with pH value of 3 ~ 7 and mass fraction of 3.5% were studied. The experimental results show that in the environment of pH 3, selective corrosion occurs in the Ni-Al bronze matrix, the surface fatigue cracks are mainly distributed on the Cu rich 偽 phase, and abrasive wear occurs in the ploughing groove of the coating. The corrosion resistance of the coating is better than that of the substrate with pH value of 7, the substrate has adhesive wear, the surface of the coating has a sheet of layered metal exfoliation, the pores in the coating contain a large amount of debris to avoid severe three-body friction, and the surface ploughing groove is shallow, and the corrosion resistance of the coating is better than that of the substrate with pH value of 7. The corrosion resistance of the coating is better than that of the substrate. In the environment of poor corrosion resistance and pH value of 11, the substrate has surface fatigue wear, deep ploughing grooves and microcracks in the wear trace of the coating. The corrosion resistance of the coating is better than that of the substrate. Generally speaking in different pH environment the corrosion and wear resistance of the coating is enhanced due to the cold working hardening and the pores of the coating receiving debris during the cold spraying process.
【作者單位】： 裝甲兵工程學(xué)院裝備維修與再制造工程系;
【基金】：軍內(nèi)科研基金資助項(xiàng)目
【分類號(hào)】：TG174.4

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