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Stainless steel product surface passivation method

A technology for stainless steel products, applied in the coating process of metal materials, etc., can solve the problems of high content of main acid and oxidant, complex passivation process, high reagent content, etc., achieve low main composition content, good corrosion resistance, and easy operation simple effect

Inactive Publication Date: 2015-09-02
HAIAN COUNTY SHENLING ELECTRICAL APPLIANCE MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the citric acid-type passivation process published by CN1412348A, the temperature reaches 70-80 °C, which makes the energy consumption higher. The passivation solution is composed of citric acid (40-110 g / L) and CZ-1A (10-30 g / L) , the main reagent content is too high and the passivation process is slightly complicated
Although the citric acid type passivation process announced by CN101748400A has a simple composition of the passivator, the contents of the main acid and the oxidant are all high

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Stainless steel surface pretreatment:

[0022] Firstly, the 304 stainless steel sheet with regular cuts was placed in a 65°C cleaning agent for ultrasonic cleaning for 6 minutes. During the cleaning process, the surface of the steel sheet should be fully cleaned. The composition of the cleaning agent includes sodium hydroxide, sulfosalicylic acid, non-ionic surfactant NP-10, coconut oil fatty acid diethanolamide 6501, sodium polyphosphate, etc., and then put the 304 stainless steel sheet into deionized water for ultrasonic cleaning 2 -3 min, dry with hot air, and set aside.

[0023] 2. Configure passivation solution:

[0024] from citric acid (C 6 h 8 o 7 , analytically pure), hydrogen peroxide (H 2 o 2 , analytically pure) and ethylene glycol (HOCH 2 CH 2 OH, analytically pure) was dissolved in deionized water in proportion to form a passivation solution containing 0.5% citric acid, 2% hydrogen peroxide, 0.5% ethylene glycol, and 97% deionized water.

[002...

Embodiment 2

[0028] 1. Surface pretreatment of stainless steel: take the stainless steel material and process it in the same way as in step 1 of embodiment 1.

[0029] 2. Configure passivation solution:

[0030] from citric acid (C 6 h 8 o 7 , analytically pure), hydrogen peroxide (H 2 o 2 , analytically pure) and ethylene glycol (HOCH 2 CH 2 OH, analytically pure) was dissolved in deionized water in proportion to form a passivation solution with 0.5% citric acid, 0.5% hydrogen peroxide, 0.5% ethylene glycol, and 98.5% deionized water.

[0031] 3. Put the stainless steel material obliquely into the prepared 30 ℃ passivation solution to ensure full contact between the stainless steel sheet and the passivation solution, and take out the stainless steel material after 120 minutes.

[0032] 4. Ultrasonic clean the passivated stainless steel in step 3 with deionized water at room temperature for 2 to 3 minutes, and then dry it with hot air to obtain the stainless steel with passivation f...

Embodiment 3

[0034] 1. Surface pretreatment of stainless steel parts: get the stainless steel parts and process with the method of step 1 of embodiment 1.

[0035] 2. Configure passivation solution:

[0036] from citric acid (C 6 h 8 o 7 , analytically pure), hydrogen peroxide (H 2 o 2 , analytically pure) and ethylene glycol (HOCH 2 CH 2 OH, analytically pure) was dissolved in deionized water in proportion to form a passivation solution containing 0.5% citric acid, 2% hydrogen peroxide, 0.5% ethylene glycol, and 97% deionized water.

[0037] 3. Immerse the stainless steel parts in the prepared 60 ℃ passivation solution, and take out the stainless steel parts after 90 minutes.

[0038] 4. Ultrasonic clean the stainless steel parts with deionized water for 2-3 minutes at room temperature, and then dry them with hot air to obtain stainless steel parts with a passivation film, and pack them into bags for later use.

[0039] The configuration of the passivation solution and the tempera...

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Abstract

The invention provides a stainless steel product surface passivation method and belongs to the technical field of stainless steel surfaces. According to the stainless steel product surface passivation method, a citric acid type passivation process replaces a strong acid and strong oxidant oriented passivation process. When the stainless steel product surface passivation method is utilized to perform stainless steel product surface passivation, complicated acid pickling or alkali washing activation process is not needed, only simple oil removing pretreatment is needed, and a stainless steel product with about 80 cm<2> passivation area can be passivated by using a 200 ml passivation solution.

Description

technical field [0001] The invention belongs to the technical field of stainless steel surface treatment, and in particular relates to a passivation treatment method for the surface of stainless steel. Background technique [0002] There is a very hard oxide layer on the surface of stainless steel, and it is more difficult to remove than the oxide layer on the surface of ordinary steel. At present, various stainless steel pickling passivation pastes and pickling passivation solutions have been developed at home and abroad. Such products They are all reagents used to remove the oxide scale layer on the surface of stainless steel at normal temperature and form a passivation protective film on the surface, but their passivation effect and usage methods are not ideal. The problem is mainly manifested in: products such as pickling passivation paste and pickling passivation solution use a large amount of raw materials such as hydrofluoric acid, sulfuric acid, hydrochloric acid, so...

Claims

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Application Information

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IPC IPC(8): C23C22/50
CPCC23C22/50
Inventor 马迪李树白李申刘怀亮贾传奇张洋狄爱俊
Owner HAIAN COUNTY SHENLING ELECTRICAL APPLIANCE MFG
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