Experimental Investigation of the Corrosion Behavior of Friction Stir Welded AZ61A Magnesium Alloy Welds under Salt Spray Corrosion Test and Galvanic Corrosion Test Using Response Surface Methodology

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="9"><hr/></td></tr><tr class="thead"><td align="left" rowspan="2">S. no.</td><td align="center" rowspan="2">Factor</td><td align="center" rowspan="2">Unit</td><td align="center" rowspan="2">Notation</td><td align="center" colspan="5">Levels</td></tr><tr class="thead"><td align="center">−1.682</td><td align="center">−1</td><td align="center">0</td><td align="center">+1</td><td align="center">+1.682</td></tr><tr><td class="thead-hr" colspan="9"><hr/></td></tr><tr><td align="left">1</td><td align="center">pH value</td><td align="center"> </td><td align="center"><span style="width: 10.9375px;"><svg height="11.175" id="M12" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 10.9375 11.175" width="10.9375" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.113)"><path d="M619 482q0 -69 -40.5 -119t-96 -72.5t-118.5 -26.5h-44l-70 20l-31 -151q-14 -67 0.5 -83t89.5 -22l-5 -28h-287l8 28q65 7 81.5 22t29.5 83l79 398q12 56 0.5 70.5t-78.5 20.5l7 28h255q108 0 164 -43t56 -125zM524 478q0 141 -146 141q-25 0 -47 -8q-16 -6 -20.5 -13.5
t-10.5 -39.5l-43 -241q37 -13 83 -13q67 0 125.5 45t58.5 129z" id="x1D443"></path></g>
</svg></span></td><td align="center">3</td><td align="center">4.62</td><td align="center">7</td><td align="center">9.38</td><td align="center">11</td></tr><tr><td align="left">2</td><td align="center">Corrosion time</td><td align="center">Hours (h)</td><td align="center"><span style="width: 11.45px;"><svg height="11.6125" id="M13" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 11.45 11.6125" width="11.45" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.55)"><path d="M649 676l-22 -187l-33 -2q3 56 -12 94q-8 20 -31.5 26.5t-86.5 6.5h-74l-90 -491q-4 -23 -6 -36.5t1 -25t7 -16.5t18 -9t27 -5t41 -3l-6 -28h-286l4 28q68 5 84 18.5t28 76.5l94 491h-55q-74 0 -100.5 -6t-41.5 -23q-24 -29 -54 -98l-32 1q32 98 53 188h22q7 -18 15 -22
t37 -4h417q23 0 33.5 5t25.5 21h23z" id="x1D447"></path></g>
</svg></span></td><td align="center">1</td><td align="center">2.62</td><td align="center">5</td><td align="center">7.38</td><td align="center">9</td></tr><tr><td align="left">3</td><td align="center">Cl<sup>−</sup> concentration</td><td align="center">Mole (M)</td><td align="center"><span style="width: 12.1125px;"><svg height="11.75" id="M14" style="vertical-align:-0.23206pt" version="1.1" viewbox="0 0 12.1125 11.75" width="12.1125" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.4)"><path d="M682 629q-1 -16 -1.5 -72t-2.5 -86l-31 -4q-5 92 -51 129t-139 37q-100 0 -177 -49t-116 -125t-39 -162q0 -122 66 -201t182 -79q83 0 137 42.5t112 128.5l26 -15q-12 -31 -42.5 -88t-45.5 -75q-139 -27 -199 -27q-148 0 -243 81.5t-95 226.5q0 173 129.5 274.5
t325.5 101.5q114 0 204 -38z" id="x1D436"></path></g>
</svg></span></td><td align="center">0.2</td><td align="center">0.36</td><td align="center">0.6</td><td align="center">0.84</td><td align="center">1</td></tr><tr class="table-tr"><td colspan="9"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

International Journal of Metals

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Table 3

Table 3: Experimental Investigation of the Corrosion Behavior of Friction Stir Welded AZ61A Magnesium Alloy Welds under Salt Spray Corrosion Test and Galvanic Corrosion Test Using Response Surface Methodology 

Table 3 | Experimental Investigation of the Corrosion Behavior of Friction Stir Welded AZ61A Magnesium Alloy Welds under Salt Spray Corrosion Test and Galvanic Corrosion Test Using Response Surface Methodology 