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RESULTS;DISCUSSIONSTheresultofthecoatingthicknessafteranodizingwithvariousH2SO4acidconcentrationsisshowninfigure2,whiletheresultofthehardnessvalueswiththeacidconcentrationisshowninfigure3,andthechangeinweightdevel
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RESULTS;DISCUSSIONS
The result of the coating thickness after anodizing with various H2SO4 acid concentrations is shown in figure 2,while the result of the hardness values with the acid concentration is shown in figure 3,and the change in weight developed after anodizing with acid concentration is shown in figure 4.The various microstructures developed in the aluminum samples before and after anodizing with various H2SO4 acid concentrations are shown in figures 5-10.
Table 1
Chemical Composition of Aluminum 5052
Element % Element %
Aluminum 96.35 Manganese 0.1
Magnesium 2.8 Chromium 0.1
Silicon 0.25 Zinc 0.1
Iron 0.4
Copper 0.1
The thickness of the coating was obtained by the expression.15
Coating thickness (mm) = weight of oxidized aluminum (grams) / 4 x 0.116 (2)
Figure 2:Variation of Coating Thickness with Acid Concentration
Figure 3:Variation of Hardness Values with Acid Concentration
Figure 4:Variation of Increase in Weight with Acid Concentration
Figure 5:Microstructure of the Aluminum Alloy (A5052) 200x.The structure revealed the α-Al (white) distribute along the grain boundary.
Figure 6:Microstructure of the Anodized Aluminum Alloy (A5052) at 2.76mol/dm3 200 x.The structure revealed the α-Al (white) distribute along the grain boundary with few anodized phase (dark)
Figure 7:Microstructure of the anodized aluminum alloy (A5052) at 3.68mol/dm3 200x.The structure revealed the α-Al (white) distribute along the grain boundary with few anodized phase (dark).
Figure 8:Microstructure of the Anodized Aluminum Alloy (A5052) at 5.52mol/dm3 200x.The structure revealed the α-Al (white) distribute along the grain boundary with more anodized phase (dark).
Figure 9:Microstructure of the Anodized Aluminum Alloy (A5052) at 7.36mol/dm3 200x.The structure revealed the α-Al (white) distribute along the grain boundary with more anodized phase (dark).
Figure 10:Microstructure of the Anodized Aluminum Alloy (A5052) at 9.20mol/dm3 200x.The structure revealed the α-Al (white) distributed along the grain boundary with more anodized phase (dark).
The structure of the anodized samples reveled α-Al (white) distributed along the grain boundary with some black layer which was distribute in the matrix of aluminum.
5.This black Al2O3 oxide layer form increased as the concentration of the acid was increased.The optimum electrolyte concentration is 30% by weight i.e.(5.52mol/dm ).Anything more than this can have an adverse effect.
REFERENCES
The result of the coating thickness after anodizing with various H2SO4 acid concentrations is shown in figure 2,while the result of the hardness values with the acid concentration is shown in figure 3,and the change in weight developed after anodizing with acid concentration is shown in figure 4.The various microstructures developed in the aluminum samples before and after anodizing with various H2SO4 acid concentrations are shown in figures 5-10.
Table 1
Chemical Composition of Aluminum 5052
Element % Element %
Aluminum 96.35 Manganese 0.1
Magnesium 2.8 Chromium 0.1
Silicon 0.25 Zinc 0.1
Iron 0.4
Copper 0.1
The thickness of the coating was obtained by the expression.15
Coating thickness (mm) = weight of oxidized aluminum (grams) / 4 x 0.116 (2)
Figure 2:Variation of Coating Thickness with Acid Concentration
Figure 3:Variation of Hardness Values with Acid Concentration
Figure 4:Variation of Increase in Weight with Acid Concentration
Figure 5:Microstructure of the Aluminum Alloy (A5052) 200x.The structure revealed the α-Al (white) distribute along the grain boundary.
Figure 6:Microstructure of the Anodized Aluminum Alloy (A5052) at 2.76mol/dm3 200 x.The structure revealed the α-Al (white) distribute along the grain boundary with few anodized phase (dark)
Figure 7:Microstructure of the anodized aluminum alloy (A5052) at 3.68mol/dm3 200x.The structure revealed the α-Al (white) distribute along the grain boundary with few anodized phase (dark).
Figure 8:Microstructure of the Anodized Aluminum Alloy (A5052) at 5.52mol/dm3 200x.The structure revealed the α-Al (white) distribute along the grain boundary with more anodized phase (dark).
Figure 9:Microstructure of the Anodized Aluminum Alloy (A5052) at 7.36mol/dm3 200x.The structure revealed the α-Al (white) distribute along the grain boundary with more anodized phase (dark).
Figure 10:Microstructure of the Anodized Aluminum Alloy (A5052) at 9.20mol/dm3 200x.The structure revealed the α-Al (white) distributed along the grain boundary with more anodized phase (dark).
The structure of the anodized samples reveled α-Al (white) distributed along the grain boundary with some black layer which was distribute in the matrix of aluminum.
5.This black Al2O3 oxide layer form increased as the concentration of the acid was increased.The optimum electrolyte concentration is 30% by weight i.e.(5.52mol/dm ).Anything more than this can have an adverse effect.
REFERENCES
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答案和解析
The structure of the anodized samples reveled α-Al (white) distributed along the grain boundary with some black layer which was distribute in the matrix of aluminum.
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