How to prevent stones embedded with copper bars from turning green?

Although copper bars are good, people often find that both sides of the gaps embedded with copper bars turn green or black during use. Very difficult to clean and remove. This phenomenon is particularly evident on stone. The reason for this is closely related to the polishing materials used for stone maintenance.

1. Acidic materials can corrode copper

Even some manufacturers’ copper bars have a certain degree of oxidation resistance under natural conditions. But when it comes to the copper bars embedded in stone, it is not necessarily a combination of the “natural conditions”. Because many marble inlaid with copper bars, the crystalline materials used for maintenance inevitably contain acidic components, such as oxalic acid, fluorosilicic acid, and so on. Even copper with antioxidant capacity generates divalent copper ions under the continuous corrosion of acidic materials and the combined action of air and water. Copper compounds are generally green and blue in color. Like copper oxalate, it appears green. Basic copper carbonate, blue in color.

Under the corrosion of crystalline stone materials, these colored copper compounds generated will naturally penetrate into the interior of the stone next to the cracks, and over time, phenomena such as greenness and blackening will occur. Moreover, copper compounds are not able to be decomposed and taken out of the stone like ordinary organic pigment pollution, so they are also difficult to clean. In addition, long-term exposure to acidic substances can also corrode and tarnish the copper strip itself.

2. How to avoid it?

01. Stone protection measures should be taken

Stone embedded with copper strips must be well protected. Especially marble with high water absorption requires the highest level of protective treatment. That is, use high-quality penetrating protective agents or fluorine based protective agents and apply them multiple times. Additional passes should be added at the gaps.

02. Carefully treat after grinding

When renovating the ground, if the copper strip can be ground and has already been ground. So the fine copper particles that are ground out will be trapped in the area where the gap is twice crossed. Therefore, it is necessary to use a high-power pumping machine to pump along the ground copper strip several times to thoroughly clean the water slurry. This can suck away the small particles of copper that we can see or cannot see. Capable of preventing or mitigating complex changes that may occur in the future.

03. Use sealing glaze instead of crystallization for polishing

After years of development, crystallization technology has emerged with various brands of products using different ingredients, but the basic principles are the same. Therefore, there are no crystalline materials that do not contain acidic components. That is to say, the marble floor embedded with copper bars, polished with crystallization technology, always has the potential to produce copper compound pollution.

So, this type of ground needs to be polished using sealing glaze technology. The principle of glaze sealing technology is to apply the silica component extracted from natural quartz ore to the surface of the stone. Crystallization technology is a chemical process, while glaze sealing technology is a physical application process. Therefore, it will not have any impact on the copper itself. Complex chemical changes will also occur. It can avoid the phenomenon of greening and blackening caused by copper bars.

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