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钢铁另件的防锈措施之一发兰——碱性氧化,通常是将另件放在氢氧化钠(NaoH)的浓溶液中煮沸一定时间来实现的。但是,这种表面处理的方法对于某些构件不适用。譬如,弹簧处于压缩状态发兰,其最大工作负荷(P_2值)将下降10～15%。某些已经发兰过的另件经过修锉后需要补兰,但补兰质量不高往往是重新发兰,碱浴煮沸的温度一般在140℃左右,这就需要消耗一定的能量。
One of the rust-proof measures for steel parts is blue-alkaline oxidation, which is usually carried out by boiling the other parts in a concentrated solution of sodium hydroxide (NaOH) for a certain period of time. However, this method of surface treatment does not apply to some components. For example, if the spring is in a compressed state, its maximum working load (P 2 value) will decrease by 10-15%. Some of the other pieces that have been made blue have to be supplemented after filing. However, the quality of patchouli is often redispensed. The temperature of the alkaline bath boiling is about 140 ° C, which consumes a certain amount of energy.