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Abstract Ni-P amorphous alloy (a.a.)with four different phosphorous contents (8, 10, 12, 14 wr%P)were electro-deposited.The corrosion rates of these electrodeposits in H_2SO_4, HCl, HNO_2, NaOH and FeCl_3·6H_2O solutions were measured and the corrosion products were examined by means of SEM, X-ray diffraction and XPS.The electrochemical parameters of thc electrodeposits in 1M H_2SO_4, 1M HCl and 1M HNO_3 were also determined.The test results showed that: 1) The corrosion resistance of the electrodeposited Ni-P (a.a.) was better than that of Ni. The corrosion rates of Ni-P (a.a.) decreased with the increase of P content. 2) X-ray diffraction and XPS revealed that after being immersed in H_2SO_4, HCl, and FeCl_3·6H_2O solutions, a compound-Ni_2P or Ni Py would form on the'surface of Ni-P (a.a.). 3) Free corrosion potential and anodic polarization curves of these amorphous alloys in 1M H_2SO_4, HNO_3 or HCl solutions shifted remarkably to more noble potential with increase of P content,
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Received: 25 June 1988
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