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Properties of Zinc vs. Manganese phosphated fasteners

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I am a metallurgical engineer work for a multinational engineering industry. I would like to know if there is any difference in the tribological properties of Zn-phosphated & Mn-phosphated fasteners? Is there any difference in fatigue properties?

Sachin S Ghanpathi
- India-Pune

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Manganese phosphate is used as a final finish plus oiling while zinc phosphate is mostly used as base to paint.

Sara Michaeli     chemical process supplier Israel

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