strip steel galvanizing line Process of anticorrosive coating, is formed by load transfer to the plating morning: plating coating level structure for particle spherical zinc powder by mechanical force transmission collision deformation, become flat, disc superposition of lamellar zinc particles...Send InquiryChat Now
Process of anticorrosive coating, is formed by load transfer to the plating morning: plating coating level structure for particle spherical zinc powder by mechanical force transmission collision deformation, become flat, disc superposition of lamellar zinc particles to condense for coating, this knot, 1 with basic physical characteristics of metal zinc coating, coating functions, is to provide basic parts of iron rust protection requirements of the anodic protection coating. The process characteristics are as follows: it has a competitive advantage in industrial application to replace hot dip galvanizing process with heavy anticorrosive coating (25-110um) for high-strength steel industrial parts that do not cause hydrogen embrittlement hazard and small rollable parts.
1. Main process of mechanical zinc plating1.1 main process flow of mechanical galvanized ironPre-treatment, oil removal, rust removal (off-line treatment)- washing, flash plating, replacement of copper, washing and mechanical plating.Zinc-deposition transition bottom layer mechanical zinc-deposition - water polishing parts ejection separation - hot water washing (or as required zero, parts surface chrome passivation, immersion related protection layer)- dry and dry a test acceptance.
1.2 pre-treatment, oil removal and rust removal of partsOf common parts, according to surface treatment of the conventional method, but the high strength steel substrate for parts of rust removal, in addition to scale, and especially pay attention to, because we can not longer using strongly acidic chemical materials containing hydrogen ions on parts surface rust removal and deoxidization, this kind of treatment will have a certain influence on permeability of hydrogen on steel base parts, so the mechanical method should be adoptedSolution: such as sandblasting, vibration finishing, pill pulling process.
1.3 flash plating replacement copperCReplacement copper layer thickness requirements, but to completely cover parts surface of substrate, its role is: improve the bonding strength, is conducive to the uniformity of coating surface condition, stop the process to produce hydrogen infiltration of matrix. Another role found, because the copper layer has good conductivity, mechanical zinc plating thickness same galvanized parts with zinc impregnation parts salt fog box comparing experiment examination, reach 11 cycles in salt spray test, found that due to salt, fog water flushing, edges and corners of the bulk seepage zinc parts appear red rust, and mechanical galvanizing edges while is dew matrix, but the batch six pieces of all does not produce red rust: this is due to the small displacement copper layer resistance, electronic conductive unimpeded