Surface CTS anti-corrosion treatment method for stainless steel part

An anti-corrosion method of a stainless steel surface, comprising the following steps:

• (1) chemically degreasing and etching with alkali the stainless steel surface using a sodium hydroxide solution and a solution containing an alkali etching active agent, followed by washing with water;
• (2) oxidizing the stainless steel surface treated in the step (1) by an oxidizing solution, followed by washing with water;
• (3) immersing the stainless steel surface treated in the step (2) as a cathode in an electrolyte to electrolyze, followed by washing with water;
• and
• (4) placing the stainless steel surface treated in the step (3) at a temperature of 50-60° C. and a humidity of 60-70% for hardening,
• wherein in the step (3), the electrolyte contains 100-150 g/L of CrO3, 100-150 g/L of Na2MoO4, 200-250 g/L of H3PO4 and 50-60 g/L of Na2SiO3;
• a current intensity is 40 to 5 A/m2 with an initial current intensity of 40 A/m2, and then the current intensity is gradually reduced to 5 A/m2 according to formula i=3+A/t, wherein i is the current intensity, t is time, and A is a parameter of 20-30.