Effect of silicon content in different substrates on the inhibitory layer of galvanized products
In order to study the influence of different Si contents on the inhibition layer of galvanized products,the DX51D+Z、SGH440 with two different Si contents were compared and analyzed.Under the premise of similar hot-rolling and galvanizing processes,the samples were washed by HCl solution and alcohol to show the pure zinc layer,and then compared and analyzed by SEM and EDS.The analysis results confirmed that the DX51D+Z zinc-inhibiting layer with Si content of 0.035%was intact and dense.However,the segregation of the oxide of SGH440 with Si content of 0.2%was more serious at grain boundary,and the zinc inhibition layer was intermittent,which was caused by the fact that the oxide of Si was difficult to be effectively reduced by Al.
hot Galvanizeddifferent Si contentFe-Al inhibition layer appearancegrain size
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