Fe 3+ PO 4 3 > these are the ions and their charges FePO 4 > the charges have to add up to zero, so one +3 iron ion cancels out one 3 phosphate ion FeP.

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Problems of staining with iron phosphate ... one moment we can have a perfect blue coat and with out changing anything on the system it starts to turn gold, giving me parts with different coatings in the same rack, and this at the end gives me parts with stains after it gets painted.

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The mining industry of Senegal is mainly centred on the production of phosphates and industrial limestone. Senegal is one of the leading producers of phosphates in the world, accounting for about 6% of exports in 2006, and deposits are of a particularly high quality.

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At these high dryoff oven temperatures and owing to the low phosphate film thickness, the steel substrate has been known to oxidize (flash rust) without affecting the iron phosphate itself. This is indicated by a shift in the color of the iron phosphated surface from blue to gold.