WHAT DOES CHROME 3D LETTER MEAN?

What Does chrome 3D letter Mean?

[18] Passivation can be Increased by shorter connection with oxidizing acids like nitric acid. Passivated chromium is stable versus acids. Passivation is often eradicated with a powerful decreasing agent that destroys the protecting oxide layer about the steel. Chromium metallic taken care of in this way quickly dissolves in weak acids.[19]Needless

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