BS EN ISO 3613:2021 pdf free

BS EN ISO 3613:2021 pdf free.Metallic and other inorganic coatings – Chromate conversion coatings on zinc, cadmium, aluminium-zinc alloys and zinc- aluminium alloys – Test methods.
This document specifies methods for the determination of
— the presence of colourless chromate conversion coatings.
— the presence of hexavalent chromium in colourless and coloured coatings on zinc or cadmium or aluminium-zinc (mass fraction of aluminium: 55 %,within a range of 54% to 56% mass fraction) and zinc-aluminium (mass fraction of aluminium: S %) alloys,
— the total chromium content per unit area on zinc and cadmium,
— the mass per unit area of both colourless and coloured coatings,
— the satisfactory adhesion of chromate conversion coatings, and
— the quality of chromate coatings.
These methods are applicable to
— colourlessand coloured chromateconversion coatingscontainingtrivalentand hexavalentchromium in varying proportions and produced by either chemical or electrochemical processes, and
— chromate coatings that are free from any supplementary coatings, such as oil, water or solvent- based polymers or wax.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3892, Conversion coatings on metallic materials — Determination of coating mass per unit area — Gravimetric methods
ISO 4520. Chromate conversion coatings on electroplated zinc and cadmium coatings
IEC 60068-2-30. Environmental testing — Part 2-30: Tests — Test Db: Damp heat, cyclic (12 h • 12 h cycle)
3 Terms and definitions
No terms and delinitions are listed in this document,
For 0,10 pig/mI Cr(Vl): Measure 2,5 ml of this solution into a second 1 000 ml volumetric flask and make up to the mark. 1 ml of this standard solution contains 0,10 pig of Cr(Vl).
For 0,13 pig/mI Cr(Vl): Measure 3,3 ml of this solution into a third 1 000 ml volumetric flask and make up to the mark. I ml of this standard solution contains 0,13 pg of Cr( VI).
For the preparation of the comparison solution for 0,10 pig/cm2 Cr(Vl), add 1 ml of orthophosphoric acid and 1 ml of diphenylcarbazide solution to SO ml of the standard Cr(Vl) solution solution with 0,10 pig/mI Cr(Vl) and mix thoroughly. Then add 2 ml of the diphenylcarbazide solution and mix. Allow the solution to stand for 10 mm for the colour reaction to be completed.
For the preparation of the comparison solution for 0,13 pig/cm2 Cr(Vl), add 1 ml of orthophosphoric acid to 50 ml of the standard Cr(Vl) solution with 0,13 pig/mI Cr(Vl) and mix thoroughly. Then add 2 ml of the diphenylcarbazide solution and mix. Allow the solution to stand for 10 mm for the colour reaction to be completed.
4.4 Test solution D (see 6.6 and 61).
Dissolve 0,50 g of diphenylcarbazide in 50 ml of acetone. Dilute slowly, while stirring, with 50 ml of water (rapid mixing can result in precipitation of diphenylcarbazide).
For maximum stability, store the solution under refrigeration in an amber-coloured glass bottle.
4.5 Sulfuric acid, diluted 1 + 3.
Slowly add one volume of concentrated sulfuric acid (p = 1,84 g/cm3) to three volumes of water.
4.6 Ammonium persulfate L(NH4)2S2081.
4.7 Sodium hydroxide (NaOH), 240 g/l solution.
4.8 Silver nitrate (AgNO3), 17 g/l solution.
4.9 Potassium dichromate (K2Cr2O7), standard solution.
Dilute 2 ml of standard volumetric potassium dichromate solution (4,9 g/l) to 1 000 ml.
4.10 Phosphate buffer solution.
Dissolve 55 g of sodium dihydrogen orthophosphate monohydrate (NaH2PO4I-lzO) in 100 ml of water.BS EN ISO 3613 pdf download.