A rubber composition prepared by compounding 0.05 to 20 parts by weight of at least one selected from substituted hydrazide compounds represented by the following Formulas (I) to (IV) per 100 parts by weight of a rubber component comprising at least one rubber selected from the group consisting of natural rubber and synthetic rubber, and a pneumatic tire using the same:
wherein A represents one selected from the group consisting of an aromatic group which may have a substituent, a hydantoin ring which may have a substituent, and a saturated or unsaturated linear hydrocarbon having 1 to 18 carbon atoms; Y represents hydrogen, an amino group, an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group, an alkenyl group, an aromatic group, a pyridyl group or hydrazino group; and R1 to R11 each represent hydrogen, an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group or an aromatic group.
A hydrazone derivative represented by Formula (V):
ZC(=O)NHN=C(CH3) (CH2CH(CH3)2) (V)
wherein Z represents 3-hydroxy-2-naphthyl, 1-hydroxy-2-naphthyl, 2-hydroxyphenyl or 2,6-dihydroxyphenyl group.
obtained show that these derivatives are good corrosion inhibitors for carbonsteel in molar HCl. Their inhibition efficiency increases with their concentration, but decreases with increasing temperature. Substituting a methyl group in MpTSH for a hydrogen atom in MBSH slightly improves its effectiveness. Both inhibitors display a mixed-type. Their adsorption on the steel surface proceeds essentially