alumina/titania chromia/titania - VeMet

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To determine the corrosion resistance ofthe as sprayed coatings for the use as afinal coating on hydraulic piston rods thefollowing tests were applied: Salt Spray test according to DIN 50021,ECP test developed by TNO/C-Cube,Chemical resistance to hydraulic fluidMineral oilWater Glycol
• Tested samples Alumina/Titania andChromia/Titania• Cross section after 1000hrs• Rest samples still running>4000hrs• No indication of corrosion of thesubstrate like:• Local spallation or cracking of thecoating• Small and few brown rust spots werevisible at Alumina/Titania sample after1000hrs• Test Chromia/Titania still running>4000hrs. No indication of any failure.Alumina/Titania87/13Chromia/Titania 75/25Carbon steel substrate 300*100*10mm
Page 2: • Wear in general has a yearly lo
Page 5 and 6: Coating Process B.C. T.C. Service E
Page 7 and 8: DRY ABRASION TESTWET PARTICLE ABRAS
Page 9 and 10: • Contact force: Actual cylinder
Page 11: Mpa80Bondstrength according to ASTM
Page 15 and 16: • Porosity is determined usinga p
Page 17 and 18: Coating Code Thickness Process Subs
Page 19 and 20: Hard chromium (G1) has anOCP of -34
Page 21 and 22: Mineral oil and water glycolfluids
Page 23 and 24: • Different surface profiles with
Page 25 and 26: • Profile is function of way of m
Page 27 and 28: Electro polymerization (monomer > p
Page 29 and 30: • Current:Directly effects temper
Page 31 and 32: Electrochemical Potential[V] vs. sa
Page 33 and 34: • Under corrosion in the bottom z
Page 35 and 36: • Dissolving of Alumina outof Alu
Page 37 and 38: • Blistering due to under corrosi

alumina/titania chromia/titania - VeMet

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