本文選題：M50鋼 + NiCrAlY涂層　； 參考：《哈爾濱理工大學(xué)》2017年碩士論文

【摘要】：NiCrAlY涂層由于具有較為優(yōu)異的抗腐蝕、抗氧化性能,被廣泛的應(yīng)用于海洋環(huán)境下的抗腐蝕涂層領(lǐng)域。目前制備NiCrAlY涂層的方法較多,但電火花沉積工藝由于其對(duì)基體的形狀要求低,可以在形狀各異的表面沉積涂層的優(yōu)點(diǎn)而被廣泛采用。因此本研究采用電火花沉積的方式在M50鋼表面制備NiCrAlY涂層,探究NiCrAlY涂層的抗鹽霧腐蝕性能。采用不同沉積方式、不同沉積厚度及不同沉積參數(shù)的方式在M50鋼表面沉積NiCrAlY涂層,通過(guò)對(duì)涂層組織結(jié)構(gòu)、物相組成、結(jié)合強(qiáng)度及抗鹽霧腐蝕性能等方面的分析,獲得了性能較為優(yōu)異的電火花沉積參數(shù)。研究表明:NiCrAlY涂層均勻致密,表面呈潑濺狀形貌。隨著涂層厚度的增加,涂層表面粗糙度變大,超聲焊槍沉積的NiCrAlY涂層均勻致密、無(wú)裂紋,但是旋轉(zhuǎn)焊槍沉積的NiCrAlY涂層出現(xiàn)明顯的裂紋。沉積電壓對(duì)涂層形貌裂紋及粗糙度的影響較大,隨沉積電壓增大,涂層粗糙度變大,旋轉(zhuǎn)焊槍沉積的涂層出現(xiàn)裂紋,而沉積電容對(duì)上述形貌的影響較小。NiCrAlY涂層的主要相組成為γ/γ'-Ni/Ni3Al相和m-β相。NiCrAlY涂層與基體為冶金結(jié)合,結(jié)合強(qiáng)度較高。在抗鹽霧腐蝕性能方面,超聲焊槍的性能要優(yōu)于旋轉(zhuǎn)焊槍。且隨著涂層厚度的增加,NiCrAlY涂層的抗鹽霧腐蝕性能上升。根據(jù)軸承的實(shí)際應(yīng)用條件,最優(yōu)厚度約為40～50 μm。沉積參數(shù)的變化對(duì)NiCrAlY涂層的抗鹽霧腐蝕性能也有影響,隨著沉積電壓及沉積電容的上升,涂層抗腐蝕性能下降,因此100 V-40μF的沉積參數(shù)的涂層抗鹽霧腐蝕效果最好。根據(jù)沉積速率,形貌及抗鹽霧性能等方面的綜合考量,NiCrAlY涂層的較優(yōu)的工藝參數(shù)為超聲焊槍沉積,沉積電壓100V,沉積沉電容40μF,涂層厚度50μm。通過(guò)上述最優(yōu)參數(shù)制備NiCrAlY涂層,按照國(guó)家標(biāo)準(zhǔn)進(jìn)行中性鹽霧試驗(yàn),進(jìn)行M50鋼和NiCrAlY涂層的抗鹽霧腐蝕機(jī)理的研究。M50鋼表面在鹽霧過(guò)程中生成Fe2O3腐蝕產(chǎn)物,隨著鹽霧試驗(yàn)的進(jìn)行,Fe2O3含量增加,氧化膜增厚,腐蝕產(chǎn)物產(chǎn)生裂紋及剝落,加速了剝落區(qū)域的腐蝕,最終在M50鋼表面形成大量腐蝕坑及腐蝕剝落區(qū)域。NiCrAlY涂層在鹽霧環(huán)境下表面也會(huì)形成主要成分為Fe、O、Cl、Cr的腐蝕產(chǎn)物,其化學(xué)通式為MexOyClz。涂層表面的Fe、Al分別在鹽霧過(guò)程中形成Fe2O3、Al2O3,最終形成由內(nèi)至外分別為M50鋼、NiCrAlY涂層、Al2O3氧化膜、Fe2O3的四層結(jié)構(gòu),有效的提高了 M50鋼的抗腐蝕能力。
[Abstract]:NiCrAlY coating has been widely used in the field of corrosion resistant coatings in marine environment because of its excellent corrosion resistance and antioxidant properties. There are many methods to prepare NiCrAlY coatings, but EDM deposition technology is widely used because of its low requirements on the shape of various surfaces. Therefore, the NiCrAlY coating on the surface of M50 steel was prepared by electrospark deposition to explore the salt spray corrosion resistance of NiCrAlY coating. The NiCrAlY coating on the surface of M50 steel was deposited on the surface of M50 steel by different deposition methods, different deposition thickness and different deposition parameters. The structure of the coating, the composition of the phase, the bonding strength and the salt fog resistance were used. The results show that the NiCrAlY coating is uniform and dense and the surface is splashed. With the increase of the thickness of the coating, the surface roughness of the coating becomes larger, the NiCrAlY coating deposited by ultrasonic welding gun is uniform and compact, without crack, but the NiCrAlY coating deposited by rotating welding gun is applied. There are obvious cracks in the layer. The deposition voltage has a great influence on the morphology crack and roughness of the coating. With the increase of the deposition voltage, the coating roughness becomes larger and the coating of the rotating welding gun has cracks, while the deposition capacitance has little effect on the above morphology. The main phases of the.NiCrAlY coating are gamma / gamma'-Ni/Ni3Al and m- beta phase.NiCrAlY coating and base. The performance of the ultrasonic welding gun is better than that of the rotating welding gun. With the increase of the thickness of the coating, the corrosion resistance of the NiCrAlY coating increases with the thickness of the coating. According to the actual application conditions of the bearing, the optimum thickness is about 40~50 mu m. deposition parameters to the salt resistance of the NiCrAlY coating. The corrosion resistance of the coating is also affected. With the increase of deposition voltage and deposition capacitance, the corrosion resistance of the coating decreases. Therefore, the corrosion resistance of the coating with the deposition parameters of 100 V-40 mu F is the best. According to the comprehensive consideration of the deposition rate, morphology and salt fog resistance, the better technological parameters of the NiCrAlY coating are the deposition of ultrasonic welding gun. Product voltage 100V, deposition sink capacitance 40 u F, coating thickness of 50 mu m. to prepare NiCrAlY coating through the above optimum parameters, neutral salt spray test according to national standard, study on the mechanism of salt fog corrosion resistance of M50 steel and NiCrAlY coating on the surface of.M50 steel to produce Fe2O3 corrosion product during salt fog process, with the salt fog test carried out, Fe2O3 content increases Adding, the oxide film thickened, the corrosion products produced cracks and exfoliation, accelerated the corrosion of the exfoliation area, finally formed a large number of corrosion pits and corrosion spalling areas on the surface of M50 steel. The.NiCrAlY coating on the surface of salt fog also formed the corrosion products of Fe, O, Cl, Cr. The chemical formula was Fe on the surface of the MexOyClz. coating, Al in salt, respectively. In the process of fog, Fe2O3 and Al2O3 are formed, and the four layer structure of M50 steel, NiCrAlY coating, Al2O3 oxide film and Fe2O3 is formed, which can effectively improve the corrosion resistance of M50 steel.

【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG174.4

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本文編號(hào)：1850981