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首页> 外文期刊>International Journal of Electrochemical Science >Corrosion Behavior of AISI 409Nb Stainless Steel Manufactured by Powder Metallurgy Exposed in H2SO4 and NaCl Solutions
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Corrosion Behavior of AISI 409Nb Stainless Steel Manufactured by Powder Metallurgy Exposed in H2SO4 and NaCl Solutions

机译：粉末冶金生产的AISI 409Nb不锈钢在H 2 SO 4 和NaCl溶液中的腐蚀行为

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Powder metallurgy is an effective method for manufacturing stainless steel parts of high quality andaccuracy at low cost. However, the use of sintered stainless steels is limited due to their low density,which deteriorates their corrosion resistance. The aim of this study was to determine the corrosionbehavior of AISI 409Nb stainless steel specimens sintered with different contents of boron in ahydrogen atmosphere. Boron was added for promoting the formation of a liquid phase during sinteringat 1150 C, thereby achieving a reduction of porosity and increase in density, which is necessary toimprove corrosion resistance. The electrochemical techniques of linear polarization resistance (LPR)and electrochemical noise (EN) were used to determine the corrosion behavior of samples with andwithout additions of boron after immersion in two solutions, 0.5M H2SO4 and 0.5M NaCl. Thecorrosion rates and the possible corrosion mechanisms in the sintered samples were determined. Theresults indicate that the samples with boron additions are more prone to corrosion due to chromiumcarbide precipitation.
机译：粉末冶金是一种以低成本制造高质量，高精度的不锈钢零件的有效方法。然而，由于烧结不锈钢的低密度，其使用受到限制，这降低了其耐腐蚀性。这项研究的目的是确定在氢气氛中用不同硼含量烧结的AISI 409Nb不锈钢试样的腐蚀行为。添加硼以促进在1150℃的烧结过程中液相的形成，从而实现孔隙率的降低和密度的增加，这对于提高耐腐蚀性是必需的。使用线性极化电阻（LPR）和电化学噪声（EN）的电化学技术确定在浸入0.5M H2SO4和0.5M NaCl两种溶液中添加和不添加硼后样品的腐蚀行为。确定了烧结样品中的腐蚀速率和可能的腐蚀机理。结果表明，由于碳化铬的沉淀，添加硼的样品更易于腐蚀。

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