Improving the methodological issues ⒐ dark residue and erosion marks DARK RESIDUES AND ETCH MARKS: usually black residue occurred at the bottom or top of the solder joint, this problem is usually improper use or cleaning flux caused by 9-1. rosin flux cleaning after soldering is not immediately, leaving dark brown residue can be cleaned in advance as possible. 9-2. acidic flux left on the joints causing corrosion black color, and can not be cleaned, this phenomenon in the hand soldering Often found in favor of the weaker of the flux and cleaned as soon as possible. 9-3. organic flux produced at a higher temperature class black charred confirm tin bath temperature, heat flux can switch to the more . soldering fixture ⒑ green residue GREEN RESIDUE: green is usually caused by corrosion, especially electronic products, but not entirely true, because it is difficult to tell in the end is green rust or other chemical products, but generally speaking the green substance was found to be as warning, reason must be identified immediately, especially such a green substance will become increasingly large, great attention should be generally available to improve cleaning. 10-1. corrosion problem usually occurs on bare copper or copper alloy surface, Use of non-rosin flux, this corrosive substances containing copper ions and therefore green, when found this green corrosion products can prove to be not cleaned properly after use of non-rosin flux. 10-2.COPPER ABIETATES is copper oxide and (rosin main component) compounds ABIETIC ACID, this substance is green but not corrosive and has a high insulation resistance, but the customer does not affect the quality of video will not agree to be cleaned. 10-3.PRESULFATE residue or substrate production On a similar residue after soldering will produce green residue request board production plant in the production of clean substrates before making cleanliness testing, to ensure the quality of the substrate cleanliness. ⒒ white corrosion eighth talk about is white residue product means white residue on the substrate, and this project is part of the foot and talk white corrosion on metal, especially easier to generate the kind of lead residue on more metal components, mainly because chloride ions easily with Lead forming lead chloride, and then with carbon dioxide to form lead carbonate (white corrosion). When using rosin flux rosin insoluble in water because the chlorine will not corrode wrapped agent, solvent, but if used improperly, can only Rosin cleaning can not remove chlorine ions, this way but to accelerate corrosion. Professional semi-dip tin stove manufacturing, Shenzhen Friends of automation equipment, professional independent brand, first-class technical team.