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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

Due to the material basis and the type of use, medical devices are subject to natural aging processes. Passivation processes with citric or nitric acid drastically increase corrosion protection and lead to a measurable benefit in product life. Surface Treatment processes like Electropolishing straighten the surface and avoid bacterial adhesion. In addition, the manufacturing process and the requirements of the purity of the products require comprehensive cleaning processes. | Download for more information.

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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 Oberfl?chentechnik D?beln has been using trivalent chrome successfully for more than a year.

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中性清洗劑–是否一直保持中性?中性清洗劑在工業清洗中的應用
2013年專家論壇第2部匯報
陽極氧化層的后處理 – 低溫高效的無鎳替代方案
鋁表面處理2000大會上最佳技術論文

鋁的陽極氧化層的后處理一般采用兩種不同的技術進行,96-100°C的熱水密封及使用反應性鹽冷密封,堵塞陽極化涂層的孔。這兩種應用都有很大的缺點。因為必須保持高溫工藝溫度,熱水密封消耗的能量極其大,而低溫密封工藝通常會使用對環境有害的鎳化合物。鎳鹽有毒且具有致癌性,對人體和健康有不可逆的影響。此外,含有鎳的廢水很難處理,尤其是還有鋁時。因此,開發了此新型無鎳技術,能夠在低溫下使用,節省了大量能量。不溶物沉積在陽極氧化層的孔中,從而產生最佳穩定性和防腐蝕性,性能超出熱水密封。此新工藝方案無毒,貯存和處理風險更低,有助于安全工作。實施新型光度學方法分析成分,工藝穩定性及生產質量得到改善。在一些情況下,陽極氧化表面的耐pH性質會得到改善,擴大了陽極氧化鋁的應用領域。此外,沖洗廢水處理在pH 9-10,因此可以與含有鋁的廢水處理交替進行。

NAVAIR三價鉻加工(TCP)涂料和工藝解決方案中的六價鉻測定
汤姆高清影院-汤姆官网