However, acid washing is of long period, inefficient and higher cost.

但该法生产周期长, 效率低,成本高.

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Main techniques for the denitrogene ration of petroleum products include acid washing, adsorption and hydrogenation.

石油脱氮技术主要有酸洗脱氮法 、 吸附脱氮法和加氢脱氮法.

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The reason for hydrogen embrittlement fracture is incomplete removal of hydrogen after acid - washing or electroplating.

是在酸洗电镀后除氢不及时或不彻底导致氢脆断裂.

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