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Cleaning I Passivation I Electropolishing in the Medical Device Industry
A Technical Whitepaper on Cleaning, Passivation and Electropolishing Processes of Surgical Instruments and Medical Implants
Formation of Trivalent Chromium Passivation Layers
The process is proven to be a safe replacement for hex chrome, but fundamental knowledge of its composition is required

Over the years, research on trivalent chromium passivation (TCP) has expanded into many fields of application, among them as a replacement for conversion coatings containing hexavalent chromium (Cr6), known as chromates. REACHcompliant TCP processes have been found to be adequate replacements for chromates, however, implementing them in the highly safety-minded aviation industry, for example, requires fundamental knowledge about the layer composition of these types of conversion coatings. This article outlines the formation of layers in trivalent chromium (Cr3) passivation over the copper-containing aluminum alloy EN-AW 2024.

Post Treatment of Anodising Layers
Nickel- and Cobalt free Alternatives Working at Ambient Temperatures

For post treating anodising layers on aluminium, typically two different technologies are applied, the hot water sealing at 96-100 °C and the cold sealing using reactive salts to plug the pores of the anodic coating. Both applications show major disadvantages. Whereas the hot water sealing is extremely energy consuming due to the mandatory hot process temperature, the low temperature sealing processes typically apply nickel compounds being harmful to the environment. Nickel salts are toxic and carcinogenetic, having irreversible effects on the human body and health. Furthermore, nickel containing waste waters are difficult to treat, especially when also aluminium is present [1]. New nickel-free technologies have been developed accordingly, enabling a low temperature application yielding in major energy savings. The deposition of antisoluble compounds in the pores of the anodizing layer leads to best stability and corrosion protection, exceeding the performance of hot water sealing. The new process solutions as being non-toxic are less risky to store and to handle, assisting the safety at work. Implementing a new photometrical method for analysing the ingredients, process stability and production quality can be improved [2]. In some cases, the pH-resistance of the anodised surface can be enhanced, extending the application field of anodised aluminium. Moreover, the waste water treatment of the rinses is carried out at pH 9–10, hence, can be done mutually with aluminium containing effluents.

Criteria for Selecting the Correct Cleaning System
Aqueous Parts Cleaning

What should users take into account when planning a new cleaning system and choosing a suitable process? Many different parameters need to be considered. A variety of different aqueous cleaning processes is available and these processes can be adapted to meet individual requirements.

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The New Generation of Chrome Plating
Specialist Finishing Company Opts for Hexavalent-Chrome-Free Process

Trivalent chrome processes are the ideal alternative to hexavalent chrome plating and produce coatings of a similar colour. The specialist finishing company Oberflächentechnik Döbeln has been using trivalent chrome successfully for more than a year.

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中性清洗剂–是否一直保持中性?中性清洗剂在工业清洗中的应用
2013年专家论坛第2部汇报
阳极氧化层的后处理 – 低温高效的无镍替代方案
铝表面处理2000大会上最佳技术论文

铝的阳极氧化层的后处理一般采用两种不同的技术进行,96-100°C的热水密封及使用反应性盐冷密封,堵塞阳极化涂层的孔。这两种应用都有很大的缺点。因为必须保持高温工艺温度,热水密封消耗的能量极其大,而低温密封工艺通常会使用对环境有害的镍化合物。镍盐有毒且具有致癌性,对人体和健康有不可逆的影响。此外,含有镍的废水很难处理,尤其是还有铝时。因此,开发了此新型无镍技术,能够在低温下使用,节省了大量能量。不溶物沉积在阳极氧化层的孔中,从而产生最佳稳定性和防腐蚀性,性能超出热水密封。此新工艺方案无毒,贮存和处理风险更低,有助于安全工作。实施新型光度学方法分析成分,工艺稳定性及生产质量得到改善。在一些情况下,阳极氧化表面的耐pH性质会得到改善,扩大了阳极氧化铝的应用领域。此外,冲洗废水处理在pH 9-10,因此可以与含有铝的废水处理交替进行。

NAVAIR三价铬加工(TCP)涂料和工艺解决方案中的六价铬测定