FIELD: chemical-thermic working. SUBSTANCE: composition has boric anhydride, aluminium oxide, aluminium, copper oxide powder and ammonium chloride and potassium tetrafluoroborate as an activating agent at the following ratio of components, wt.-% copper oxide powder 10-40; aluminium oxide 29-31; aluminium 10-25; ammonium chloride 2-4; potassium tetrafluoroborate 2-3, and boric anhydride the rest. Use of proposed composition ensures to obtain complex diffusion layers of thickness up to 240 mcm. EFFECT: increased saturation capacity, corrosion resistance and wear-resistance. 2 tbl
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