In this case, brass pins are dark red/brown because of NO2 fumes released when concentrated nitric acid contacted the brass components.
这里，因为受到浓缩硝酸所释放的二氧化氮的腐蚀，使得黄铜珠子变成深红棕色。
When contacting the softer brass or nickel-silver of locking components, pick and tension tools leave marks in the form of gouges and scratches.
而且当单钩和别子在开锁时和相对柔软的黄铜或镀镍层接触的时候，就会留下凿痕和磨擦的痕迹。
The ideal materials to replace diverse mechanically stressed and abrasion-resistant brass casting components.
是各种机械受力、耐磨铜铸件的理想替代材料。
应用推荐