Metal Finishing Guide Book

2013

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Figure 1 Figure 2 electrical resistance [LER]), and it meets or exceeds ASTM-D2559-9, MIL-DTL5541F, and MIL-DTL-81706 for electrical resistance. Therefore, it is useful in electronic equipment where surface resistivity is critical and required. The trivalent chromium pretreatment has excellent adhesion and bonding properties and provides an undercoat for organic coatings, such as paints. It meets or exceeds dry tape adhesion requirements for ASTM-D3359 methods A & B. This trivalent chromium pretreatment is an ideal undercoat for cured coatings and overcoat for plated materials that require subsequent hydrogen relief. This unique trivalent chromium pretreatment can be exposed to temperatures exceeding 800¡F following a 24-hour cure period. It can be baked for hydrogen relief in excess of 500¡F for more than 24 hours without loss of performance, whereas hexavalent chromates cannot be baked above 140¡F without loss of performance. In most cases, corrosion-resistance performance of this trivalent chromium 344

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