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Henkel’s Bonderite M-NT 4850-2 (was Alodine 4850-2) is a liquid concentrate that produces a chrome-free conversion treatment on light metals. It can also be used as a chromium free post-passivation on phosphated surfaces. Bonderite M-NT 4850-2 provides, in aqueous solutions, colourless conversion layers on light metals in immersion and spray applications. Both treatments provide an excellent corrosion resistance, as well as excellent adhesion properties for subsequent painting. Bath maintenance is controlled by determining the pH value and electrolytic conductivity. The conductivity should be kept constant during operation, and it should be noted that iron ions in the passivation bath can impair the conversion layer quality, so the maximum iron concentration should not rise above 10ppm. (Bath construction should be of fluoride resistant plastic such as hard PVC or PP, with racks of aluminium, stainless steel or hard PVC). Bonderite M-NT 4850-2 baths must be treated to remove metal ions and neutralised before adding to normal waste water.