经济型高耐候钢耐大气腐蚀性能研究

Effect of Cr-Sb Addition on Atmospheric Corrosion Resistance of Economical High Weathering Steel

在周浸腐蚀条件下,研究了不同Cr-Sb组合高耐候钢的腐蚀行为。结果表明,随着Sb的增加,耐蚀性不断提升;但Sb的添加,增加了试验钢的点蚀倾向。可以通过降Cr提Sb提升试验钢的腐蚀性能,但当Cr降到3.5%时,耐蚀性出现了拐点,腐蚀速率大幅提升。Cr-Sb协同不改变试验钢锈层的物相组成。Cu在锈层与腐蚀坑内富集形核,抑制了S向基体内扩散,提升了材料的耐蚀性。

The corrosion behavior of high weathering steels with different among of Cr-Sb addition was studied via cyclic wet-dry corrosion test.The results show that the corrosion resistance is improved,but the pitting tendency increases for the steel with the Sb addition.The corrosion performance of the steel can be improved by reducing Cr while increasing Sb.However,when Cr is reduced to 3.5%,the corrosion resistance shows an inflection point,then the corrosion rate is greatly increased.Cr-Sb synergy does not change the phase composition of the rust scale of the test steel.Cu is enriched and nucleated in the rust scale and corrosion pits,and the Cu-rich phase can inhibit the inward diffusion of S into the matrix,which improves the corrosion resistance of the steel.