为什么在我的金属箍的中间部分没有黑镍这个问题，就得用上好多页纸才能回答清楚。
The complete story of why the center of my ferrule has no black nickel on it would take pages to explain.
表面处理：镀锌(蓝锌、黄锌及镀锌上蜡)、镀镍、磷化黑。
Surface processing: plate the zinc (blue zinc, yellow zinc and plate the zinc up the wax) and plate the Ni, point phosphate to turn black.
尤其在中、高端散热器电镀方面，在酸性镀铜、镀镍、黑镍等有着丰富的生产实践经验，在电镀行业领域具有领先地位。
Especially in, high-end radiator electroplating, in acidic copper, nickel, black nickel, and so has the rich production experience, in electroplating industry area is the leading status.
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