本文關(guān)鍵詞： 活塞環(huán)槽 鍍鉻 六價(jià)鉻　出處：《大連海事大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：船舶低速柴油機(jī)活塞環(huán)槽在高溫、高壓、腐蝕、摩擦等工況下,工作壽命極易受到影響。鍍鉻技術(shù)在活塞環(huán)槽表面生成一層硬度較高的鍍鉻層,可以提高環(huán)槽表面的耐高溫高壓、耐腐蝕磨擦性能,所以在活塞環(huán)槽表面處理中得到普遍應(yīng)用。 大連迪施船機(jī)有限公司在活塞制造及翻新過(guò)程中采用滾鍍鍍鉻技術(shù)處理活塞環(huán)槽表面。在生產(chǎn)過(guò)程中,曾經(jīng)出現(xiàn)過(guò)電鍍質(zhì)量問(wèn)題。確定原因是準(zhǔn)備翻新的舊活塞在進(jìn)入電鍍槽之前未清潔徹底,金屬雜質(zhì)進(jìn)入鍍液,通過(guò)共用的鍍液循環(huán)進(jìn)入新活塞的電鍍槽,最終使新活塞環(huán)槽鍍鉻層出現(xiàn)氣孔,導(dǎo)致產(chǎn)品返工。 本論文通過(guò)實(shí)驗(yàn)檢驗(yàn)大連迪施實(shí)際生產(chǎn)中的鍍液配比是否合理。同時(shí),確認(rèn)鍍液對(duì)主要雜質(zhì)的容忍度,為實(shí)際生產(chǎn)提供理論指導(dǎo)。所用電源為恒定電位儀,采用的是六價(jià)鉻鍍鉻工藝,設(shè)定幾種鍍鉻溶液,通過(guò)設(shè)計(jì)的鍍層性能測(cè)試實(shí)驗(yàn),確定鍍層性能最為優(yōu)良的鍍液,然后對(duì)此鍍液成分進(jìn)行單因素實(shí)驗(yàn),得到了最佳的六價(jià)鉻鍍鉻的工藝參數(shù)：CrO3:220～270g/L,H2SO4:1.92g/L,CrO3/H2SO4=130:l。針對(duì)上述鍍液,通過(guò)實(shí)驗(yàn)分析最易對(duì)鍍層造成影響的幾種雜質(zhì)的含量范圍,以便在生產(chǎn)實(shí)踐中及時(shí)監(jiān)測(cè)雜質(zhì)含量,以免影響鍍層效果。確定的鍍液對(duì)于幾種主要雜質(zhì)的容忍度為：三價(jià)鉻含量控制在4～8g/L,鐵離子含量不得超過(guò)8g/L,銅離子含量不得超過(guò)8g/L,氯離子含量不得超過(guò)8g/L。 在大連迪施實(shí)際生產(chǎn)中,改變了以前生產(chǎn)中翻新、新品鍍液混用的生產(chǎn)流程。電鍍槽改良為獨(dú)立循環(huán),同時(shí)根據(jù)上述實(shí)驗(yàn)數(shù)據(jù)加強(qiáng)鍍液雜質(zhì)監(jiān)控,降低了電鍍出現(xiàn)質(zhì)量問(wèn)題的幾率,提高了生產(chǎn)效率。
[Abstract]:Under the conditions of high temperature, high pressure, corrosion, friction and so on, the working life of the piston ring groove of low speed marine diesel engine is easy to be affected. It can improve the high temperature and high pressure resistance and corrosion resistance of ring grooves, so it is widely used in the surface treatment of piston ring grooves. In the process of piston manufacture and renovation, Dalian Dish Shippers Co., Ltd. uses the technology of chrome plating to treat the surface of piston ring groove. There have been problems with electroplating quality. The reason is that the old piston that is ready to be renovated has not been cleaned thoroughly before entering the electroplating bath, the metal impurity enters the plating bath, and the electroplating tank of the new piston is circulated through the common plating bath. Finally, the new piston ring slot chrome plating layer blowhole, resulting in product rework. This paper tests whether the proportion of plating bath is reasonable in the actual production of Dish in Dalian. At the same time, it confirms the tolerance of the bath to the main impurities, and provides theoretical guidance for practical production. The power source used is a constant potential instrument. The hexavalent chromium plating process is adopted, and several kinds of chromium plating solution are set up. Through the test experiment of the coating performance, the best plating bath is determined, and then the single factor experiment is carried out on the composition of the plating bath. The optimum process parameters of hexavalent chromium plating are obtained: 1: CrO3: 220g / L H2SO4: 1.92g / L. In view of the above bath, the content range of several impurities which are most likely to affect the coating is analyzed through experiments, so that the impurity content can be monitored in time in the production practice of CRO _ 3 / H _ 2SO _ 4 / 130: l. The tolerance of the plating solution to several major impurities is determined as follows: trivalent chromium content is controlled at 4g / L and iron ion content should not exceed 8g / L. The copper ion content must not exceed 8 g / L, the chlorine ion content must not exceed 8 g / L. In the actual production of Dish in Dalian, the production process of renovation in previous production and mixed use of new product plating bath has been changed. The electroplating bath has been improved to independent circulation, and the impurity monitoring of plating bath has been strengthened according to the above experimental data. The probability of quality problem in electroplating is reduced, and the production efficiency is improved.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U664.121.1

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本文編號(hào)：1481129