The test proves that the dark, soft spots are not corrosion spots.
试验证实黑斑不是腐蚀痕。
Water vapor aging test whether experiment: discoloration or corrosion, and the subsequent spots solderability.
水蒸气老化实验：测试是否变色或腐蚀斑点，及后续的可焊性。
Deep-drawn wash tank with rounded-corners: easily accessible, easy to clean. No corrosion of welding spots;
深拉式圆弧角洗涤水槽 ：无焊接、无腐蚀、易操作、易清洗；
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