Color corrosion condition of silicon core strip
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Dear experts, I soaked the colored silicon cores (in blue, yellow, red, and green) that came off from the large rod materials in hydrofluoric acid for 30 minutes and 60 minutes, and then cleaned and wiped them. Among these, most of the yellow-colored silicon cores could be wiped away, while those that remained could not be removed； Only a tiny amount of the blue, red, and green silicon cores can be erased; the vast majority cannot be erased ； Therefore, if color appears in the silicon core due to the formation of SiO2 or Si3N4, why can’t it be wiped off after soaking? And with a mixed acid of HF+HNO3, it can be wiped off with just a gentle rinse? I’m seeking help from all the experts! :'(
Why isn’t anyone answering? Experts, please give some advice to this newbie
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