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When soldering galvanized iron, the first step is to prepare the surface properly. This may involve cleaning the area to remove any corrosion, dirt, or impurities that could affect the bond. It's also essential to remove a small portion of the zinc coating at the soldering point to facilitate a better connection between the solder and the base metal.
Hydroxyethyl cellulose is non-toxic, non irritating, and has no allergic reactions to the human body, and has good biocompatibility. This makes it widely applicable in the pharmaceutical field, such as a drug carrier, biomaterial, etc., which can achieve sustained release and targeted delivery of drugs while reducing stimulation and damage to human tissues.