Effect of boronizing composition on boride layer of boronized GGG-60 ductile cast iron

• Boriding agents and their compositions in boronizing medium are very effective on the formation of boride layer and phases.
• The best boriding compositions for liquid boriding of GGG-60 cast iron are %65 borax – %25 Fe–Si – 10% NaOH and 70% borax – 30% B4C.
• The suggestible composition for pack boronizing of GGG-60 is 85% B4C – 15% Na2CO3.

Boronizing of GGG-60 nodular cast iron samples were performed by immersion in molten salts. These were based on borax containing eight reducing agents: Na2CO3, CaCl2, NaCl, NaOH, B4C, SiC, Al and ferrosilicon. Also the cast iron samples were boronized with pack boronizing method using different mixture compositions such as B4C, borax, Na2CO3, and SiC. This work gives a survey on the nature and quality of the layers which were obtained according to the boronizing composition. The effects of the boronizing bath composition on the obtained layers' quality are also discussed. The results of the studies show that the most suitable boronizing compositions for electroless liquid boronizing of GGG-60 cast iron are %65 borax – 25% Fe–Si – 10% NaOH and 70% borax – 30% B4C in order to obtain the hardest and the thickest boride layer. On the other hand, the suggestible composition for pack boronizing of it is 85% B4C – 15% Na2CO3.