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采用不同热处理工艺(热处理温度、热处理时间和冷却方式)对含镁铝新型建筑结构材料进行了热处理,并进行了电化学腐蚀试验。结果表明:在热处理时间4h时,随热处理温度从600℃升高至800℃或在热处理温度675℃时,热处理时间从2h延长至5h,材料的耐腐蚀性能均先提高后下降。在热处理时间4h时,675℃热处理比600℃热处理的腐蚀电位正移116mV、腐蚀电流密度减小56%;在热处理温度675℃时,4h热处理比2h热处理的腐蚀电位正移81mV、腐蚀电流密度减小41%;在热处理675℃×4h时,炉冷比水冷的腐蚀电位正移157mV、腐蚀电流密度减小50%。
The heat treatment process (heat treatment temperature, heat treatment time and cooling method) was adopted to heat treat the new building materials containing Mg-Al and electrochemical corrosion tests were carried out. The results show that when the heat treatment time is increased from 600 ℃ to 800 ℃ or the heat treatment temperature is 675 ℃, the heat treatment time is prolonged from 2h to 5h at 4h, then the corrosion resistance firstly increases and then decreases. At 4h, the corrosion potential at 675 ℃ is 600m higher than that at 600 ℃, and the corrosion current density is reduced by 56%. At the temperature of 675 ℃, the corrosion potential of 4h heat treatment is 81mV more than that of 2h heat treatment. The corrosion current density Decrease by 41%. When the heat treatment is 675 ℃ × 4h, the corrosion potential of furnace cooling is shifted 157mV more than that of water cooling, and the corrosion current density is reduced by 50%.