On the principle of phosphate coating formation, the paper introduces the inspection method and the process procedure of oil pipe coupling in the phosphate solution.
根据磷化膜的形成原理，介绍了油管接箍在磷酸盐溶液中的工艺处理过程和检验方法。
The key basic technology in full mould casting process includes: material and formation of pattern, coating, vibratory fill of moulding sand as well as molten metal filling.
实型铸造法的关键基础技术包括：模样的材料及成形、涂料、型砂的振动充填、金属液的充填。
The original surface of a steel specimen was identified by pure nickel so as to study the formation process of a vanadium carbide coating on the surface of the steel specimen through TD treatment.
利用纯镍标识钢的原始表面，研究了钢经td处理所产生的碳化钒覆层形成过程。
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