SUS304ss包埋粉末渗铝的耐蚀性能

CORROSION RESISTANCE OF PACK ALUMINIZED SUS304 STAINLESS STEEL

展开了SUS304ss及其渗铝后在0.33mol/L FeCl_3+0.05 mol/L HCl溶液中的耐蚀性实验、1000℃下的抗高温氧化实验及表面沉积碱金属氯化物和硫酸盐在500℃下的耐蚀性实验,用失重法和电化学方法等综合评定了SUS304ss渗铝后的耐蚀性。研究表明:渗铝SUS304ss表面渗铝层结构致密,厚度为50μm;在0.33mol/LFeCl_3+0.05 mol/L HCl溶液中SU5S304ss发生了严重孔蚀,渗铝后表面发生轻微孔蚀;渗铝SUS304ss在1000℃下加热,表面和截面形貌完好,耐高温氧化性提高了约5倍;在500℃下表面沉积盐碱混合物,渗铝SUS304ss耐腐蚀性约提高20倍;渗铝后SUS304ss的腐蚀电位大于未渗铝钢,耐蚀性提高。

In order to research the corrosion resistance of SUS304 stainless steels with pack aluminized process, the corrosion resistance tests in 0.33 mol/L FeCl3＋0.05 mol/L HCl, the oxidation tests at 1000 ℃, and the corrosion resistance tests in deposition of alkali-chloride and sulphate at 500 ℃ were conducted. The corrosion resistance was comprehensively evaluated by weight loss method and electrochemical tests etc. The experimental results indicated that aluminized layer of SUS304ss was dense, and the thickness was 50 μm; the pitting corrosion resistance of aluminized SUS304ss was better than that of unaluminized one; the oxidation properties of aluminized SUS304ss increased 5 times at 1000 ℃ ; the corrosion resistance of aluminized SUS304 in deposition of alkali-chloride and sulphate increased about 20 times at 500 ℃; the corrosion potential of aluminized SUS304 was higher than that of unaluminized one, which had better corrosion resistance.