Effect of three kinds of medium molecular weight proteins on the corrosion resistance of Ni⁃Ti and stainless steel arch wires

Abstract

Objective To explore the influence and mechanism of different types of proteins on the corrosion resis⁃ tance of alloy to provide a reference for the safe application and surface modification of nickel⁃titanium (Ni⁃Ti) and stainless steel bow wires in the clinic. Methods The effects of fibrinogen, IgG and mucin on the electrochemical corro⁃ sion resistance of Ni⁃Ti and stainless steel arch wires were tested by the potentiodynamic polarization method, and the repair ability of passive films on surfaces treated with the three proteins were tested by the cyclic polarization method. Inductively coupled plasma optical emission spectrometry (ICP⁃OES) was used to determine the types of corrosion prod⁃ ucts, and the surface morphology after corrosion was analyzed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Results The addition of fibrinogen, IgG or mucin to an alloy has different effects on its corrosion resistance. Adding protein can reduce the corrosion resistance of stainless steel alloys and slow the corrosion process of Ni⁃Ti alloys. The addition of mucin can improve the corrosion resistance of Ni⁃Ti alloy and the repair ability of passive film. Compared with mucin and IgG, fibrinogen can reduce the pitting resistance of Ni⁃Ti and stainless steel alloys. Con⁃ clusion Different types of proteins interact differently with the arch wire, form different deposition morphologies on the surface, and participate differently in the corrosion process of the alloy.

Keywords

• Corrosion，
• Ni⁃Ti alloy，
• Stainless steel alloy，
• Protein adsorption，
• Fibrinogen，
• Mucin，
• Immuno⁃ globulin G，