对金属保护的抗刮伤、耐磨损和缓蚀有机、无机混合材料保护层

1、Scratch,wear and corrosion resistant organic inorganic hybrid materials for metals protection and barrier对金属保护的抗刮伤、耐磨损和缓蚀有机、对金属保护的抗刮伤、耐磨损和缓蚀有机、无机混合材料保护层无机混合材料保护层孙新肖孙新肖精选课件论文概况论文概况l摘要(Abstract)l材料与实验(Experimental Details)l结果与讨论(Restults and discussion)l结论(Conclusions)2精选课件Abstract Polysiloxanes are widely used as protective barriers to delay erosion/corrosion and increase chemical inertness of metal substrates.In the present work,a high molecular weight methyl phenyl polysiloxane resin was design

2、ed to manufacture a protective coating for Fe 430 B structural steel.Visual appearance and morphology of the coatings were studied by field emission scanning electron microscopy and contact gauge surface profilometry.Micro-mechanical response of the coatings was analyzed by instrumented progressive load scratch,while wear resistance by dry sliding linear reciprocating tribological tests.3精选课件Abstract Lastly,chemical inertness and corrosion endurance of the coatings were evaluated by linear sweep

3、 voltammetry and chronoamperometry in aggressive acid environment.The resulting resins yielded protective materials,which feature remarkable adhesion to the substrate,good scratch resistance and high wear endurance,thus laying the foundations to manufacture long lasting protective barriers against corrosion and,more in general,against aggressive chemicals.4精选课件Experimental DetailsMaterials：The substrates are flat slabs in structural Fe 430B steel 40 mm long,30 mm wide and 5 mm thick.The hybrid o

4、rganic-inorganic resin is a modified methyl phenyl vinyltriethoxysilane.AlMg(4.5 wt.%)powders metalpigments.Additives like thickeners,flow promoters,wetting agents and defoamers.5精选课件Experimental DetailsManufacturing process:1.Metal substrates pre-treated by a lapping machinewith sand paper(Al2O3 400 mesh size)until the achievement of a fairly smooth and homogenous morphology.2.Pre-treated substrates were washed in an ultrasonic bath of isopropyl alcohol,followed by an additional washing in a so

5、lution of an alkaline detergent in demineralized water.3.The substrates were rinsed with bi-distilled water and dried overnight at 60 C in a vacuum oven.4.Pre-treated substrates were sprayed(2 bar feeding pressure,nozzle 0.8 mm,stand-off distance 400 mm)with dilutedpolysiloxane resins with or without the metal pigments dispersedinside or with a pre-hydrolyzed solution of vinyltriethoxysilane(2 wt.%)in ethanol(96%)and demineralized water.6精选课件Experimental DetailsIn the former case,the coated subs

6、trates were pre-dried for few minutes at environmental conditions(20 C and 40%HR)and subsequently baked in convection oven at 250 C for 45 min to cross-link the polysiloxane resin.In the latter case,the organo-silane interlayers were pre-dried for few minutes at environmental conditions($20 C and 40%HR)and subsequently baked in convection oven at approximately 100110 C for 10 min to achieve the full consolidation of the primer.The organo-silane coated metal substrates were then recoated with a s

7、econd layer of the polysiloxane resin.Its dring process is the same as the former case.7精选课件Experimental DetailsAll the manufactured coatings are summarized in Table 1.Four reference samples in Fe 430 B,uncoated or Zn coated(deposited by hot dipping,cold spraying,electro-galvanizing),with layers of equivalent thickness to the above mentioned hybrid organic inorganic coatings,was used for comparative purposes.8精选课件Experimental DetailsExperimental procedure:Coatings thickness and their uniformity

8、was measured by a magnetic inductive gauge,performing nine measurements equally distributed over the coated surface.Cross-cut tape test method and pencil test method were performed to evaluate the coatings adhesion to the substrate and their hardness.Coatings morphology was analyzed by contact inductive gauge of a CLI profiler.Stored profiles were elaborated using theTaly Map 3.1 software,and main roughness parameters were evaluated.A Field Emission Gun Scanning Electron Microscope was used to e

9、xamine the visual appearance and morphology of the coatings.9精选课件Experimental Details Scratch tests were performed on the protective coatings,operating in“progressive loadmode,using a Rounded Conical Rockwell C diamond indenter,with 200 and 800 um tip radius.Wear endurance of the coatings was assessed by ball-on-flatlinear reciprocating tribological tests,using spherical counterpart Electrochemical tests were performed by dipping the substrates in an electrolytic cell with an aqueous solution of

10、 H2SO4(0.5 M).It mainly concluds linear sweep voltammetry and chronoamperometry to examine coatingsperformance of corrosion resistant.10精选课件Results and discussion11精选课件Results and discussion图图2 2，是金属基质和各涂层，是金属基质和各涂层外表的粗糙度外表的粗糙度涂层R和V/R的平均粗糙度大约在0.16和0.17um，这个数值比经摩擦后金属基质的粗糙度大约0.45um)还要小。涂层P和V/P的平均粗糙度大约在0.37um。而涂层RP和V/RP的平均粗糙度大约在0.17-0.2之间，和涂层R和V/R的平均粗糙度很接近。涂层R和V/R与涂层P、V/P、RP和V/RP在外貌和粗糙度的不同主要是因为后者添加了直径大约为10um的Mg-Al粉体的颜料。虽然这个研究中涂层的厚度限制在60-80um，但是一些颜料仍然可从涂层外表凸起，它们增加了外表的粗糙度。12精选课件Results and discussion

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