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<table>Variation of Mg/Al and Si/Al ratios with the temperature for the untreated surface.</table>

Advances in Materials Science and Engineering

fig6

Figure 6

Figure 6: XPS Study of Chemical Changes on the La/Ce Treated Surface of A361 Aluminium Alloy Exposed to Air at Temperatures up to <svg style="vertical-align:-0.26999pt;width:55.099998px;" id="M1" height="17.35" version="1.1" viewBox="0 0 55.099998 17.35" width="55.099998" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(.022,-0,0,-.022,.062,16.962)"><path id="x1D7D3" d="M148 676h322l-45 -127h-276l-22 -81q103 -6 151 -20q82 -23 127.5 -79.5t45.5 -134.5q0 -109 -79 -176q-78 -66 -203 -66q-64 0 -105.5 25.5t-41.5 62.5q0 26 17.5 43.5t43.5 17.5q47 0 100 -46q49 -42 90 -42q42 0 71 29.5t29 74.5q0 51 -36.5 90.5t-105.5 61.5
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