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i-P- Diamond Composite
 January 30th, 2012, 0:43 |
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Ni-P-Diamond Composite Coating organizational structure and performance
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volumetric wear layer is amorphous, amorphous coating or no grain boundary segregation, easy to generate uniform and stable passive film, thus effectively blocking the coating in corrosive media further dissolution; The coating crystallization, not only defects increase, and white precipitate will form micro-cell corrosion, accelerated corrosion of the alloy; Ni-p-diamond composite coating compared with the Ni-P coating, whether in acid or salt, both plated state or the state of heat treatment, corrosion resistance are reduced. This is because the composite coatings compared with ordinary coating, coating the surface of the particles protruding from the destruction of the passive film integrity, uniformity, and the particles in the composite components may appear uneven around the region, especially the nuances of P content the formation of galvanic corrosion, reduced corrosion resistance of the coating. Table 1 coating in different media immersion corrosion weight loss Note: table data in units of weight loss: Illg, al1 the use of sub-oxidation of the sample placed in a crucible furnace at different temperatures in the oxidation of the oxidation weight gain and oxidation time Figure 6 shows the relationship between. Seen from the diagram, Ni-P coating and Ni-P. Oxidation kinetics of diamond coating Basic parabolic curve, with the oxidation time, by (continued on page 56) plus 27 Chen Fei and other titanium surface hydrogen-free carburizing arc-glow plasma corrosion resistance of the research (on the next p. 27) re-stabilized. Oxidation temperature, oxidation increased in the 400 ~ C and 500 ℃,ralph lauren skjorter, oxidation is very small, 600oC, when two kinds of oxide coatings were significantly increased. Oxidation at different temperatures, Ni-P coatings have shown than the Ni-P_ diamond composite coating for better resistance to oxidation, especially at elevated temperatures, the difference is more obvious in the 800 ~ C when the Ni-P coating abnormal oxidation weight gain,abercrombie fitch, that although in the beginning stages of oxidation weight gain is also higher than the 700 ~ C, but with the oxidation time, even lower than the amount of oxidation 700 ~ C. The composite coatings were oxidation weight gain increases with temperature. Ni-P coating good antioxidant capacity from the uniformity of their organization, rugged composite coating surface micro-particles exist, undermining the substrate Ni-P oxide film integrity. The Ni-P coating produced more uniform oxide film formation, so that the temperature reaches 800 ~ C, the coating surface in the initial rapid oxidation to generate a more compact oxide film, oxidation after prolonged oxidation weight gain is extremely small,abercrombie, even when less than 700 ~ C the oxidation weight gain. L-● Pan Chang 1 Xiu-l at different temperatures in Figure 6 oxidation coating weight gain vs. time curve 563 Conclusions (I) Ni-P-P diamond composite coating mass fraction of 10%, when the amorphous state plating,abercrombie fitch düsseldorf, coating After 300 ℃, lh after the crystallization heat treatment to produce Ni phase and NiP phase. The higher temperature heat treatment, crystalline phase to precipitate and grow. (2) compared with Ni-P coating, Ni-P_ diamond composite coating of higher hardness, wear resistance and better. Two kinds of coatings by 400%, lh the best hardness and wear resistance after heat treatment. But the wear resistance of Ni-P coating by heat treatment temperature effect is obvious, and the wear resistance of composite coating less affected by temperature, so the difference between two kinds of coating wear volume was the largest in the state when plated. (3) compared with Ni-P coating, Ni-P_ diamond composite coating of corrosion resistance and oxidation resistance are reduced. [References] [1]. Xu Qiang age. Modern surface treatment technology [M]. Shanghai: Shanghai Science and Technology Press,ralph lauren polo, 1994. [2] car Cheng Huan. Composite plating technology development and application [J]. Material protection, 1991,24 (9): 4. [3] LiHX, LaiPJ. 'I'necrystallizationofNi-Pamorphousalloy [J]. App1. Surf. Sei. , 1998,125:115. [4] unKL, LaiPJ. ThecrystalliT ~! Ionofelectro-lessNi-Pdeposit [J]. J. Electrochem. SOC. ,abercrombie münchen, 1989,abercrombie fitch hamburg,136 (12): 3803. [5] BerKhO, Bodnev & sA,abercrombie online shop, eta1. ElectrodepositedNi-P-SiCcoin-politeco ~,, gs [J]. & SurfaceFi cricket, 1995, (11): 62. [6] Tong Guo, Yuan Zhang. Composite coating [M]. Tianjin: Tianjin University Press, l991. [7] with Wolfgang Rieder. Electroless nickel [M]. Shanghai: Shanghai Jiaotong University Press, 1996.
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