Small amounts of boron were transferred from the electrode to weld metal by adding boron oxide or ferroboron powder to the electrode covering.
通过在焊条药皮中加入氧化硼或硼铁向焊缝渗入微量硼。
2
Iron oxide red is an excellent pigment, which has fine qualities such as covering power, coloring power, heat resistance, resistance to solvent, acid fastness, innocuity and anti-rust.
氧化铁红具有良好的颜色遮盖力、着色力、耐热、耐溶剂、耐酸性、无毒、防锈等性能，是优质的颜料品种。
3
Using the all closed covering low-temperature method, we successfully made the packaging and sampling of ethylene oxide standard.