新型防渗硫复合涂料在球墨铸铁件生产中的应用

Application of New Anti-Seepage Sulfur Composite Coating to the Production of Ductile Iron Castings

采用呋喃树脂砂生产球墨铸铁件时,铸件表面会出现不同深度的片状石墨层或蠕变层,而渗硫是出现这一现象的主要原因。通过分析球墨铸铁件表层的渗硫机理,配制了三种不同类型的防渗硫复合涂料,并进行了试验验证。结果表明,在石英粉和石墨粉的复合涂料组分中,加入一定量的助溶剂A、助溶剂B和白云石粉,能够有效地阻止含硫气体渗入铸件表层,从而减少变异石墨层的出现。

When furan resin sand is used to produce ductile iron castings,flake graphite layers or creep layers with different depths will appear on the casting surface,and sulfurization is the main reason for this phenomenon.By analyzing the sulfurization mechanism of the surface layer of the ductile iron castings,three different types of anti-seepage sulfur composite coatings were formulated and verified by experiments.The results showed that adding a certain amount of cosolvent A,cosolvent B and dolomite powder to the composite coating components of quartz powder and graphite powder effectively prevented sulfur-containing gas from penetrating into the surface layer of castings,so as to reduce the appearance of variant graphite layer.