S. Atashin
金属学报(英文版)
In this article the corrosion rate of the austenitic stainless steel type 304, under the synergistic effect of environmental factors has been assessed via potentiodynamic polarization scan. Salinity, velocity, pH and temperature are the factors which induce effects on the corrosion rate of the considered metal. Quantitative analysis is applied using the full two-level factorial experimental design method, which results in the contribution value of each parameter in changing the quantity of average corrosion rate in both individual and synergistic cases. Besides this quantitative analysis, qualitative analysis has been used to predict the variation direction. These two analyses show the important role of the synergistic action, which changes the variation direction of corrosion rate and the contribution percentage of each parameter in varying the value of corrosion rate. Applying both these analyses can show the magnitude and quality of each parameter's effect, which is remarkably valuable in marine applications.
关键词:
Stainless steel 304
,
environmental parameters
,
seawater corrosion
,
synergistic effect
王永利
,
马利
,
熊良银
,
刘实
中国腐蚀与防护学报
doi:10.11902/1005.4537.2015.124
采用二苯碳酰二肼比色法分析测试了不同状态的304不锈钢样品在自来水环境下的Cr6+溶出规律,并对样品进行了微观组织分析.结果表明,不同状态的不锈钢材料中Cr6+溶出量差别很大,材料中的球状氧化物夹杂尺寸越大、数目越多,对应的Cr6+溶出量越高.采用粉末烧结的方法在金属中引入Cr203夹杂和Cr203+MnO2复合夹杂并测试Cr6+的溶出规律,结果显示Mn02的添加大幅度提高了Cr6+的溶出量,且氧化物添加量越多,Cr6+溶出量越大.证实了Cr/Mn复合氧化物夹杂分布(尺寸和密度)对不锈钢样品Cr6+溶出量有重要影响:在含Cl的水环境下,Cr/Mn复合氧化物夹杂既是Cr3+来源,又提供了氧化剂使Cr3+转化为Cr6+.这表明通过控制铸件或粉末冶金件中的Cr/Mn复合氧化物夹杂的尺寸和数目,可大幅度降低材料Cr6+的溶出量.
关键词:
304不锈钢
,
Cr6+
,
夹杂
,
Cr/Mn复合氧化物
