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The Deposition Process and the Properties of Direct Electroless Nickel-Phosphorous Coating with Chromium-Free Phosphate Pickling Pretreatment on AZ31 Magnesium Alloy

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Academic year: 2019

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Figure 1. SEM micrograph (a) and the corresponding EDS spectrum (b) of AZ31 magnesium alloy after sanding
Figure 3 and Table 1, the element composition in area I (the dark region) is similar to that of magnesium alloy substrate for they mainly contain Mg, O, and Al elements
Table 1. Chemical compositions of magnesium alloy before and after phosphate pickling pretreatment (in wt%) obtained by EDS analyses
Figure 4. open potential-time curves of phosphate pretreatment on magnesium alloy substrate at different temperature
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