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This paper on the gray iron multiple composite process, as well as multiple complex process of materials and properties of the experiment, multiple composite sample process for the Multi-seepage treatment after a passive or oxidation process.
Experimental results show that the multi-gray iron permeation of treatment, usually white surface layer of the compound and composition of the transitional zone. Multi-infiltration handling the higher the temperature, hardness, the lower layer, the lower the temperature, the higher the hardness layer, the layer thickness of the major high and low temperature and the length of processing time of impact. The higher the temperature, the longer the time, the thick layer. The processing of raw materials, the use of on the 1st, No. 2 oxidation of the surface can easily be uniform, the bright color of the black oxide. The Multi-seepage treatment of the samples, using 1, on the 2nd of liquid on the surface only for the Multi-blue infiltration kind of get a lighter color of the oxide layer, and on the 3rd oxidation of the Multi - Infiltration red and blue samples of the surface, can be uniform and dense Shen Heise oxide. The impact of passive temperature of the surface after more color, at 400 ℃ quenching liquid than passive at 200 ℃ at quenching passivation of the color to get some depth. Heating the surface to have little effect on the color, whether it is quenched before quenching after heating or heating, basic access to a black color.
Infiltration of multiple samples were passive and oxidation can be dealt with after the color for the black oxide film, in the subsequent corrosion test, the passivation and processing of samples of corrosion resistance and were only carried out multiple samples of anti-seepage treatment Erosion of comparison, has improved.

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