B, barrier type protective effect when the cold sprayed zinc coating is oxidation, will produce a layer of zinc salt in the coating surface to provide barrier protection.

屏障式保护作用当冷喷锌涂料被氧化时，会在涂料表面产生一层锌盐层来提供屏障保护。

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At the same time, the binder in the cold spraying zinc coating also provides an additional barrier protection, so as to slow down the oxidation of zinc.

同时冷喷锌涂料中的粘合剂也提供一层附加的屏障保护，从而减缓锌的氧化。

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Heavy metals originally immobilized by sulfate reduction in sludge barrier may be released out secondarily because of the oxidation of sludge.

在硫酸盐还原作用下已经固定在污泥中的重金属，可能会由于污泥的氧化而二次释放。

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