| Hot-dip galvanizing is one of the most effective methods for improving thecorrosion resistance of steel in the automotive and construction industry. As thehot-dip galvanized products have good corrosion resistance, and the process is simple,low production costs, so hot dip galvanizing technology in the automotive, metallurgyand electricity has been widely used.But still there is a long-standing problem in the galvanizing industry: excessivegrowth of silicon-containing coating causes performance deterioration. Currentlycommon practice is to add a different pool of zinc alloy plating elements to suppressovergrowth. In a continuous galvanizing line to get good alloy coating, generallyadded Ni, Al, V and other elements, such as silicon elements can have a goodinhibitory effect reaction. Add a small amount of Ni to Si content is suppressed about0.1wt.%Reactive silicon steel, the coating thickness can be reduced to improve thecorrosion resistance of the coating and surface mobility. Al is an element commonlyadded zinc industry because it Fe2Al5ZnXinhibiting layer may be formed instead ofthe formation of tissue broke ζ phase, to improve the coating gloss, but also canreduce the oxidation of the zinc surface. The researchers found that adding zinc poolSb, Zn can form the appearance of a beautiful flower in the coating, and also refinedgrains, reducing dross and enhanced mobility. In order to get the appearance ofbeautiful, affordable and reasonable structure of galvanized products, we need todesign a reasonable Zn-Sb-M (M=Ni, Al, V) alloy, to provide the market with goodprospects of a galvanized products provide a theoretical foundation.In order to clarify the role of galvanizing bath process elements Al and Sb andZn Sb pool synergistic effects of Al and Zn-Fe interface was added to the reaction.Therefore, we need further studies Zn-Fe-Al-Sb quaternary phase diagram and theactual production of hot-dip galvanized to guide thermodynamic calculations. Thisexperiment is a balanced alloy method, and X-ray diffractometer (XRD) Zn contentwas determined by means of fixed93at.%Of the Zn-Fe-Al-Sb by using scanningelectron microscopy energy dispersive spectroscopy (SEM-EDS) combined zinc-richcorner of the quaternary system450℃isothermal section. Experimental resultsshow that: the quaternary system in equilibrium with five four zones: L-Zn+Sb2Zn3+δ+ζ, L-Zn+δ+Sb2Zn3+AlSb, L-Zn+δ+T+AlSb, L-Zn+Fe2Al5+T+AlSb and L-Zn+Fe2Al5+FeAl3+AlSb,4three-phase equilibrium zone: L-Zn+Sb2Zn3+ζ, L-Zn+Sb2Zn3+δ, L-Zn+Fe2Al5+AlSb and L-Zn+FeAl3+AlSb. L-Zn+AlSbphase region and L-Zn+T, L-Zn+δ, L-Zn+Fe2Al5coexistence and L-Zn+FeAl3phase region. Sb in ζ, T, δ, Fe2Al5and FeAl3solubility is very limited, but themaximum solubility of Zn in AlSb, Fe2Al5and FeAl3is5.3,12.3and6.2at%,respectively. In this experiment, found no new ternary compounds.To study the mechanism of Ni and Sb galvanized interfacial reaction and providea theoretical basis for the development of new Zn-Ni-based alloys, and for theZn-Fe-Ni-Sb quaternary phase diagram pave the way. This work studied the Ni-Sb-Znternary system of three isothermal sections at450,600and900°C. At450°Cisothermal section, found three ternary compounds, namely; NiSbZn (τ1), Ni2SbZn2(τ2) and Ni3Sb2Zn (τ3). The presence of17-phase regions, including12three-phaseregions can be confirmed by experiment, and the remaining five could have beeninferred based on the correlation coefficient and the fraction. Ni solubility in SbZn,Sb2Zn3and Sb3Zn4phase is very small, but the maximum solubilities of Zn in NiSband NiSb2were5.6at.%And1.6at.%, respectively. The isothermal section at600°C,found four ternary compounds were NiSbZn (τ1), Ni2SbZn2(τ2), Ni3Sb2Zn (τ3) andNi4.6SbZn (τ4). The presence of15phase regions, including10three-phase regionscan be experimentally confirmed, the remaining five could have been inferred basedon the correlation coefficient and the fraction. The maximum solubilities of Zn inNiSb, NiSb2, Ni5Sb2and Ni3Sb were1.9,1.0,7.3, and1.6at.%, respectively. Theisothermal section at900℃, found four ternary compounds were NiSbZn (τ1),Ni2SbZn2(τ2), Ni3Sb2Zn (τ3) and Ni4.6SbZn (τ4). |
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