Aluminum based anodes and process for preparing the same
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example 1
Corrosion Rate after SSHT Before Decomposition
[0011]1.5 kg of Al—Mg 2.5% alloy was smelted from 1.462 kg of aluminum (purity 99.99%) and 0.038 kg of magnesium (purity 99.999%) in a graphite crucible in an induction furnace under a protective atmosphere. Magnesium and other alloying elements were wrapped up in Aluminum foil and plunged into already melted Al. The melt was poured out into a steel mould of 150×15×260 size. Before casting the melt was vigorously stirred by graphite rod. The same procedure (besides the alloy's composition) was used for smelting of all the mentioned below Al base alloys.
[0012]Casting stress relief annealing was carried out at 350° C. for two hours, cooled down to room temperature and then the strips were rolled in a duo rolling mill to a thickness of 3.5 mm. This annealing procedure is optional and may be performed to reduce internal stress and to homogenize the structure. SSHT of the strips was carried out in an electric batch type furnace with circulati...
example 2
Corrosion Rate after Artificial Aging
[0017]The alloys prepared according to the procedure detailed above were additionally subjected to artificial aging. The corrosion rate .vs. the time of aging of the various alloys is shown below in Table II.
TABLE IIAgingTime of aging / CorrosionAlloy composition(° C.)rate (h / (mg / cm2min))Al—Mg 2.5%15090 / 0.47; 175 / 0.4; 220 / 0.42Al—Mg 3.0%150170 / 0.38;Al—Mg 4.5%—Ga 0.5%15090 / 0.58; 190 / 0.52Al—Mg 6%15090 / 0.60; 175 / 0.49Al—Mg 2.7%—Si 0.7%16090 / 0.77; 175 / 0.63Al—Mg 2.1—Ge 0.6—Ga16090 / 0.71; 175 / 0.590.3Al—Si 1.2%19090 / 0.79; 175 / 0.65
example 3
Comparison Between Corrosion Rates when Using Artificial Aging and Plastic Deformation
[0018]1.5 kg of an Al—Mg 3.4% alloy was prepared according to the procedure described in Example 1. The ingot of size 150×15×260 mm was rolled to the strips having thickness 4.5 mm. The solid solution heat treatment for these strips was carried out as follows: heating up to 415° C., maintaining at this temperature for 4 hours and quenching in water at room temperature. After quenching the strips were rolled from the thickness of 4 mm to 1.1-1.2 mm and then some samples (Group A) were electrochemically tested and some of them (Group B) were subjected to aging process at 150° C., before electrochemical testing.
[0019]The results show that the average corrosion rate for Group A samples was 0.33 mg / cm2·min The results of the corrosion test for samples of Group B are summarized in Table III
TABLE IIITime of aging, h067.5133.5200263Corrosion rate, mg / cm2 / min0.340.340.330.320.34
[0020]From comparing the resu...
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