Effect of A1 on the hardness and wear resistance of the electroboronized surface

The effect of A1 in molten borax on the electroboronizing and on the wear resistance has been studied. Wear test using the lubricant was made as a function of frictional rate and frictional distance. The boronized depth and microhardness were increased with increasing A1 content, electrolysis time and electrolysis temperature. The molten electrolyte of 10-30g Al/200g Na2B4O7 was considered as the optimum composition for wear resistance, temperature was 8000C, the best result of wear resistance was obtained. The wear resistance was raised in case of tempering the pre-quenched specimen at 2500C for 2 hrs. The high temperature wear test showed that at elevated temperature the wear volume of boronized specimen was decreased more than at room temperature. (author)