本文選題：鋁合金 + 刷鍍銀��； 參考：《沈陽(yáng)工業(yè)大學(xué)》2017年碩士論文

【摘要】：鋁及鋁合金具有比重小、壓鑄加工便利、導(dǎo)電性與導(dǎo)熱性好等優(yōu)點(diǎn),在工業(yè)生產(chǎn)中應(yīng)用日益廣泛。隨著科技的進(jìn)步,和人們生活水平的不斷提高,對(duì)鋁合金的需求日益增加,不論是航天航空領(lǐng)域的輕型材料,還是汽車(chē)輕量化技術(shù)都離不開(kāi)鋁合金的參與。但是鋁及鋁合金也存在易產(chǎn)生晶間腐蝕,表面硬度低,不耐磨等性質(zhì)。對(duì)鋁進(jìn)行電鍍,改善其表面性能是十分有必要的。鋁合金鍍銀是對(duì)其表面改性的重要的一種方法,對(duì)于一些特殊鋁合金工件往往采用電刷鍍的辦法。鋁表面容易在空氣中與氧氣反應(yīng)生成一種自然氧化膜,導(dǎo)致被鍍金屬與基體結(jié)合力不好,目前針對(duì)鋁合金鍍銀已經(jīng)有很多前處理辦法能夠得到合適的刷鍍銀層。但隨著鋁合金應(yīng)用環(huán)境更廣泛,在一些高溫環(huán)境下鋁合金刷鍍銀層與基體結(jié)合力不佳。解決鋁合金刷鍍銀層能夠耐500℃高溫?zé)嵴鹗潜菊n題的目的。實(shí)驗(yàn)過(guò)程中研究了浸鋅前處理以及陽(yáng)極氧化前處理工藝對(duì)氰化物體系刷鍍銀層的影響,研究不同前處理工藝或工藝參數(shù)對(duì)其微觀形貌、耐蝕性、耐熱震性、抗變色性的影響。選取陽(yáng)極氧化時(shí)間為4min氧化電壓為13V的工藝參數(shù)處理鋁合金表面、并對(duì)使用有氰預(yù)鍍銀-無(wú)氰刷鍍銀與無(wú)氰預(yù)鍍銀-無(wú)氰刷鍍銀所得鍍層的綜合性能進(jìn)行比較。研究結(jié)果發(fā)現(xiàn)通過(guò)四種浸鋅工藝得到的刷鍍銀層不耐500℃熱震,前處理過(guò)程中浸鋅與預(yù)鍍銅會(huì)夾雜在鍍層與鋁合金基體之間,在高溫下通過(guò)鍍層縫隙擴(kuò)散到達(dá)鍍層表面。在氧化時(shí)間為4min氧化電壓為13V及氧化時(shí)間為10min氧化電壓為13V時(shí)能夠得到耐熱震500℃的刷鍍銀層;結(jié)合生產(chǎn)實(shí)際,減小時(shí)間成本,選用氧化時(shí)間4min、氧化電壓13V作為陽(yáng)極氧化參前處理參數(shù),在此參數(shù)基礎(chǔ)上的有氰體系刷鍍銀層在0.1mmol/L Na2S與0.1mol/L K2SO4溶液中自腐蝕電流密度分別為1.898×10-6A/cm2,9.43×10-6 A/cm2;在氧化時(shí)間為4min氧化電壓為13V的前處理參數(shù)下,無(wú)論采用有氰預(yù)鍍還是無(wú)氰預(yù)鍍方法,有氰預(yù)鍍-無(wú)氰刷鍍銀層耐蝕性要比無(wú)氰預(yù)鍍-無(wú)氰刷鍍銀層耐蝕性要好,兩種刷鍍銀層耐熱震性能均不佳。
[Abstract]:Aluminum and aluminum alloys are widely used in industrial production because of their advantages such as low specific gravity, convenient die casting, good conductivity and good thermal conductivity. With the development of science and technology and the improvement of people's living standard, the demand for aluminum alloy is increasing day by day. Both the light materials in aerospace field and the lightweight technology of automobile can not be separated from the participation of aluminum alloy. However, aluminum and aluminum alloys are also prone to intergranular corrosion, surface hardness, wear resistance and other properties. It is necessary to electroplate aluminum to improve its surface properties. Silver plating is an important method for surface modification of aluminum alloy, and brush plating is often used for some special aluminum alloy workpieces. The surface of aluminum can easily react with oxygen in air to form a kind of natural oxide film, which leads to poor adhesion between metal and substrate. At present, there are many pre-treatment methods for silver plating of aluminum alloy to obtain suitable brushing silver coating. However, with the wide application of aluminum alloy, the adhesion between silver coating and substrate is not good in some high temperature environments. The purpose of this project is to solve the problem that the silver coating of aluminum alloy brushes can withstand 500 鈩，

本文編號(hào)：1947235