Analysis of the undesirable phenomenon in the cleaning of the white copper (shield industry)

Analysis of Undesirable Phenomena in Cleaning White Copper (Shield Industry) When numerous metal processing plants come across the handling of foreign copper and copper products, they often encounter headaches regarding how to effectively clean these materials. Despite guidance from cleaning agent manufacturers, companies sometimes fail to fully grasp certain issues that arise during the cleaning process. This article aims to analyze some of these problematic scenarios for better understanding. Firstly, assessing the effectiveness of degreasing is crucial. After washing the product, rinse and dry it. If traces of dirt remain on its surface, take a clean cloth, apply a small amount of white mineral oil or alcohol, and gently rub the workpiece’s surface. Observe if the dirt persists. If it does not, the cleaning agent isn’t effective enough. If the dirt remains, try applying slightly more effort without being overly aggressive. If the dirt is removed, it indicates that the cleaning agent works for general grime but struggles with stubborn residues. Further vigorous wiping should reveal if the dirt can be removed entirely. Additionally, test some untreated parts using the same method. If identical dirt appears, trace back through the previous processing steps to identify and eliminate the source of such stubborn residues. While it might seem convenient to let the cleaning agent handle such issues, doing so significantly increases costs. Secondly, addressing fingerprints left post-cleaning is another concern. Water-based cleaning agents can typically remove minor fingerprints, but heavy ones may persist. Start by gently wiping the affected area. Handprints usually disappear upon wiping, even after baking and drying. If wiping doesn’t help, test on an untreated piece to confirm if the issue arises during the cleaning process. If untreated workpieces still show fingerprints, the issue could stem from chemical reactions between the fingerprints and the workpiece material. This happens frequently in processing facilities and should be addressed at the source. Avoid direct hand contact during processing to prevent fingerprints, reinforcing management practices to ensure cleanliness. Thirdly, yellowing of products can manifest in various ways—whole, partial, or spotted. If entire surfaces turn yellow or even black over time, the cleaning agent is likely at fault. Partial yellowing could indicate either corrosion of the copper material by the cleaning agent or remnants of cleaning solution leading to discoloration. Test the area with a gentle wipe—if it comes off, it's residue-related. Spotted yellowing suggests incomplete degreasing or rinsing, requiring further attention to these stages. Fourthly, watermarks appearing post-cleaning often point to rinsing water quality issues. Begin by verifying the functionality of your pure water system, followed by checking the water quality in the rinse tanks. A straightforward test involves wiping a clean workpiece with alcohol, immersing it in rinse water, and drying it with a hairdryer to detect watermarks. If marks appear, examine the water quality. If drying without a blower shows no marks, place the workpiece in a drying device. If watermarks reappear, clean the device as internal dirt may settle on the workpiece during drying. Company: Shenzhen Evergreen Chemical Technology Co., Ltd. Tel: Steel Structure Industrial Building

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