(四)Co—Cr_3C_2复合电镀钴金属本身具有十分优越的耐高温性能,在国外曾有钴—铬合金镀层成功地应用于火炮炮管内孔上。钴与碳化铬微粒形成复合镀层后,其耐高温性能又有所提高,同时,其耐磨性也很好,在相同的条件下,其磨耗量只有Ni—SiC复合镀层的一半。这种复合镀层在800℃高温条件下仍然是耐磨的。它已成功地应用到航空部件上。以钴作为基质的复合镀层所以具有优越 (D) Co-Cr_3C_2 composite electroplating Cobalt metal itself has a very high temperature performance, cobalt-chromium alloy coating in foreign countries have been successfully used in artillery barrel hole. Cobalt and chromium carbide particles to form a composite coating, its high temperature performance has improved, at the same time, its wear resistance is also very good, under the same conditions, its wear is only half of the Ni-SiC composite coating. This composite coating is still wear-resistant at temperatures up to 800 ° C. It has been successfully applied to aviation components. It is superior to cobalt-based composite coating