同时，联接面也不会出现锈点。

Meanwhile, no rust spots are on friction surface.

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专家的意见是机器在电镀之后锈点才能完全去掉。

Our expert is of the opinion that the rust is not scour completely before the machine is electroplate.

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电镜扫描观察发现，1420铝锂合金锈点直径较大，且连成片，表面明显变色。

SEM observation showed that the surface of 1420 Al-Li alloy turn colors, and rust spot become bigger after salt corrosion.

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