Effect of Na2MoO4 on bond strength of adhesive-bonded phosphate coated magnesium AZ31 sheets
Source abstract
Abstract
Abstract A pretreat phosphate solution having the formulation of KMnO 4 , K 2 HPO 4 , Na 2 SiO 3 , NaF and Na 2 MoO 4 was developed to improve the strength of adhesive-bonded magnesium AZ31 joints. The phosphate coating which has the magnesium phosphate, MgO, Mg (OH) 2 , MgF 2 and minor Al 2 O 3, , Al(OH) 3 Al 0.35–0.55 Si 0.10–0.48 P 0.13–0.35 O 2.1–2.2 and, Al 0.35 Si 0.48 P 0.18 O 2.2 , and Al 0.52 P 0.48 O 2.2 was formed on the surface of the magnesium AZ31 after treatment. The additives Na 2 MoO 4 in a phosphate-permanganate solution mainly act as an accelerator to speed up the coating formation. The combination of Na 2 MoO 4 and NaF improves significantly the corrosion resistance of the magnesium AZ31 and performance of adhesive bonded joints. The joint strength and durability of the bonded Mg AZ31 joints in hot-humid environmental condition are superior to that of the phosphate treated (RPT) and CrO 3 etching (CET) pretreated samples.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnesium Alloys: Properties and Applications · Magnesium Oxide Properties and Applications · Layered Double Hydroxides Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (46)
Show source-provided references
1. Corrosion protection of magnesium AZ31 alloy using poly(ether imide) [PEI] coatings prepared by the dip coating method: influence of solvent and substrate pre-treatment10.1016/j.corsci.2010.09.040 ↗
2. Research for a new age of magnesium in the automotive industry10.1016/S0924-0136(01)00780-4 ↗
3. A review of laser welding techniques for magnesium alloys10.1016/j.jmatprotec.2005.06.068 ↗
4. Laser assisted self-pierce riveting of AZ31 magnesium alloy strips10.1016/j.matdes.2009.10.038 ↗
5. The influence of ceramic particles on bond strength of cold spray composite coatings on AZ91 alloy substrate10.1016/j.surfcoat.2010.06.008 ↗
6. Protective coatings on magnesium and its alloys—a critical review10.1016/S0925-8388(01)01899-0 ↗
7. Preparation and characterization of Ca-P coating on AZ31 magnesium alloy10.1016/S1003-6326(10)60555-9 ↗
8. Chromate conversion coatings
9. Conversion-coating pretreatment for magnesium alloys by a permanganate-phosphate solution10.1016/S0254-0584(02)00481-9 ↗
10. A chrome-free conversion coating for magnesium–lithium alloy by a phosphate-permanganate solution10.1016/j.surfcoat.2007.07.094 ↗
11. A chromium-free conversion coating of magnesium alloy by a phosphate-permanganate solution10.1016/j.surfcoat.2005.07.064 ↗
12. Tomlinson CE. Conversion coatings for metals using group VI-Z metals in the presence of little or no fluoride and little or no chromium. US5952049; 1999.
13. In-situ study of the formation process of stannate conversion coatings on AZ91D magnesium alloy using electrochemical noise10.1016/j.corsci.2009.11.009 ↗
14. Stannate conversion coatings on Mg–8Li alloy10.1016/j.jallcom.2008.03.041 ↗
15. The effect of surface modification and stannate concentration on the corrosion protection performance of magnesium alloys10.1016/j.surfcoat.2008.08.070 ↗
16. Standard Guide for Preparation of Metal Surfaces for Adhesion bonding. ASTM international D 2651-01.
17. Phosphate-functionalized ORMOSIL coatings for magnesium alloys10.1016/j.porgcoat.2009.03.001 ↗
18. The influences of duty cycle on the bonding strength of AZ31B magnesium alloy by microarc oxidation treatment10.1016/j.surfcoat.2010.05.016 ↗
19. Improvement of anticorrosion and adhesion to magnesium alloy by phosphate coating formed at room temperature10.1016/S1003-6326(09)60304-6 ↗
20. A chromium-free conversion coating of magnesium alloy by a phosphate-permanganate solution10.1016/j.surfcoat.2005.07.064 ↗
21. Influence of fluoride ions on the amorphous phosphating of aluminum alloys10.1016/j.surfcoat.2007.05.034 ↗
22. Pretreatment of various substrates prior to electrocoating10.1016/S0026-0576(01)81412-4 ↗
23. Liu ZX, Sun RN, Mao ZP, Wang PC. Effect of surface pretreatment and environmental exposure on static strength of adhesive-bonded magnesium AZ31 sheets, Research Reports, GM, ER99; 2011.10.1016/j.surfcoat.2012.02.031 ↗
24. Oxidizing alternative species to chromium VI in zinc galvanized steel surface treatment. Part 1—a morphological and chemical study10.1016/S0257-8972(98)00464-2 ↗
25. Oxidizing alternative species to chromium VI in zinc-galvanized steel surface treatment. Part 2—an electrochemical study10.1016/S0257-8972(98)00476-9 ↗
26. Effects of pH of an Na2MoO4–H3PO4 type aqueous solution on the formation of chemical conversion coatings on steels10.1016/0010-938X(89)90047-4 ↗
27. The development of passivation coatings by cathodic reduction in sodium molybdate solutions10.1016/0010-938X(88)90025-X ↗
28. Molybdate/Al(III) composite films on steel and zinc-plated steel by chemical conversion10.1016/S0010-938X(01)00174-3 ↗
29. Composite anticorrosion coatings for AZ91D magnesium alloy with molybdate conversion coating and silicon sol–gel coatings10.1016/j.porgcoat.2009.07.003 ↗
30. Modifying organic coatings to provide corrosion resistance: part II–inorganic additives and inhibitors10.1016/S0026-0576(02)80382-8 ↗
31. Molybdate/phosphate composite conversion coating on magnesium alloy surface for corrosion protection10.1016/j.apsusc.2008.04.095 ↗
32. Study of molybdenum/lanthanum-based composite conversion coatings on AZ31 magnesium alloy10.1016/j.apsusc.2010.10.077 ↗
33. An environmentally friendly molybdate/phosphate black film on Mg–Zn–Y–Zr alloy10.1016/j.surfcoat.2010.03.006 ↗
34. Iron phosphate coatings-composition and corrosion resistance10.5006/1.3315980 ↗
35. Adhesive joining of aluminum AA6082: the effects of resin and surface treatment10.1016/j.ijadhadh.2008.01.002 ↗
36. Pretreatment of aluminum: topography, surface chemistry and adhesive bond durability10.1016/0143-7496(95)98739-9 ↗
37. Chastain · 1992
38. XPS study of as-prepared and reduced molybdenum oxides10.1016/0169-4332(95)00317-7 ↗
39. A novel phosphate conversion film on Mg–8.8Li alloy10.1016/j.surfcoat.2008.10.004 ↗
40. An environmentally friendly molybdate/phosphate black film on Mg–Zn–Y–Zr alloy10.1016/j.surfcoat.2010.03.006 ↗
41. Freeman · 1986
42. A rapid durability test method for adhesives10.1016/S0143-7496(99)00045-7 ↗
43. The adhesively bonded Al joint: the effect of pretreatment on durability10.1080/00218468808071288 ↗
44. Effect of material geometry surface treatment and environment on the shear strength of single lap joints10.1016/j.ijadhadh.2009.02.012 ↗
45. Durability of an off-optimum cured aluminum joint10.1016/S0143-7496(03)00102-7 ↗
46. Long-term durability in water of aluminum alloy adhesive joints bonded with epoxy adhesives10.1016/S0143-7496(96)00038-3 ↗