BS EN ISO 9717:2017 pdf free

BS EN ISO 9717:2017 pdf free.Metallic and other inorganic coatings – Phosphate conversion coating of metals
Phosphated test pieces are treated with an appropriate corrosion-protecting medium (e.g. oil) under specified conditions and these treated test pieces are subjected to the neutral salt spray test (see ISO 9227 ). The test may be used either to evaluate a specific corrosion-protecting system or for comparative testing of a range of phosphate conversion coatings in conjunction with a specific corrosion-preventing medium.
Immerse the phosphated component or test panel in the corrosion-protecting medium under examination, carefully following the appropriate instructions and ensuring that the liquid, semi-solid or waxy film which forms on the phosphated surface is free from air bubbles and discontinuities.
Before testing, suspend the test pieces for at least 24 h at a temperature of 23 °C±5 °C and a relative humidity not exceeding 65 %, in a dust and draught-free atmosphere, so as to allow the surplus of oil to drip off and the solvents to evaporate.
Suspend the phosphated test pieces (previously dried at a temperature of between 100 °C and 120 °C  and cooled to room temperature) from suitable plastic hooks or plastic-coated steel hooks and immerse them vertically in the oil for 1 min at a temperature of 25 °C±2 °C. During this time, move the test panels gently to and fro and then withdraw them gradually from the oil in about 30 s. The oil film that forms on the phosphated surface shall be free from air bubbles and discontinuities.
Suspend the test panels for at least 24 h at a temperature of 23 °C±5 °C and a relative humidity not exceeding 65 %, in a dust and draught-free atmosphere, prior to testing.
This test determines the exposure times attainable by a specific corrosion-protecting system before the first evidence of corrosion of metal becomes visible.
For this purpose, take test pieces from the test chamber at predetermined intervals and examine them visually (with corrected vision if necessary) for evidence of corrosion. Whether or not the after-treatment film (or layer) is to be removed before visually examining the components or test panels is subject to agreement.BS EN ISO 9717 pdf download.