The hydrogen gas evolution rate of AA5052 alloy in 4 M sodium
hydroxide-ethylene glycol solution (water/ethylene glycol volume
ratio of 7:3) with different additives is shown in Table 1.
The hydrogen gas evolution rate of AA5052 aluminium alloy
electrode in 4 M sodium hydroxide solution (Blank) is
0.909 mL min1 cm2. The proton of ethylene glycol is much less
active than that of water in 4 M sodium hydroxide-ethylene glycol
solution and retard the hydrogen gas evolution [25,26]. In order to
further retard the hydrogen evolution, we add dicarboxylic acids in
this electrolyte solution. The hydrogen gas evolution rate are 0.166,
0.118 and 0.141 mL min1 cm2 for AA5052 alloy in 4 M sodium
hydroxide-ethylene glycol solution containing 1 mM SUA, 1 mM
ADA and 1 mM SEA, respectively. Clearly, the addition of the
dicarboxylic acids and ethylene glycol reduces the evolution rate of
hydrogen gas significantly, indicating that they can inhibit the
corrosion of AA5052 alloy in alkaline solution effectively.
The hydrogen gas evolution rate of AA5052 alloy in 4 M sodiumhydroxide-ethylene glycol solution (water/ethylene glycol volumeratio of 7:3) with different additives is shown in Table 1.The hydrogen gas evolution rate of AA5052 aluminium alloyelectrode in 4 M sodium hydroxide solution (Blank) is0.909 mL min1 cm2. The proton of ethylene glycol is much lessactive than that of water in 4 M sodium hydroxide-ethylene glycolsolution and retard the hydrogen gas evolution [25,26]. In order tofurther retard the hydrogen evolution, we add dicarboxylic acids inthis electrolyte solution. The hydrogen gas evolution rate are 0.166,0.118 and 0.141 mL min1 cm2 for AA5052 alloy in 4 M sodiumhydroxide-ethylene glycol solution containing 1 mM SUA, 1 mMADA and 1 mM SEA, respectively. Clearly, the addition of thedicarboxylic acids and ethylene glycol reduces the evolution rate ofhydrogen gas significantly, indicating that they can inhibit thecorrosion of AA5052 alloy in alkaline solution effectively.
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