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Chromium-free passivation solution for tin plate and method for using same

A tin-plated steel plate and chromium passivation technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problems of high cost and difficult treatment of chromium-containing wastewater, and achieve low cost and excellent anti-sulfur spotting. Sexual, cost-saving effect

Inactive Publication Date: 2010-02-03
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the treatment liquid contains hexavalent chromium, which is harmful to the environment, and the treatment of chromium-containing wastewater is difficult and costly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The passivation solution is composed of cerium nitrate, ammonium nitrate and water, and the weight distribution ratio is respectively: 5 g of cerium nitrate, 7 g of ammonium nitrate, and 1000 g of water. The pH value of the passivation solution is 4, and the pH is adjusted by dilute nitric acid.

Embodiment 2

[0021] The passivation solution is composed of cerium nitrate, ammonium nitrate and water, and the weight distribution ratio is respectively: 10 g of cerium nitrate, 15 g of ammonium nitrate, and 1000 g of water. The pH value of the passivation solution is 4, and the pH is adjusted by dilute nitric acid.

Embodiment 3

[0023] The passivation solution is composed of cerium nitrate, ammonium nitrate and water, and the weight distribution ratio is respectively: 15g of cerium nitrate, 10g of ammonium nitrate, and 1000g of water. The pH value of the passivation solution is 4, and the pH is adjusted by dilute nitric acid.

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Abstract

The invention relates to an acid metal passivation solution and a method for using the same, in particular to a chromium-free passivation solution for a tin plate and a method for using the same. Thepassivation solution comprises the following components in portion by weight: 5 to 30 portions of inorganic salt of a rare earth element Ce or La, 5 to 40 portions of inorganic salt of ammonium and 1,000 portions of water; the pH value of the passivation solution is between 2 and 7 and can be adjusted by dilute nitric acid or dilute sulfuric acid; the inorganic salt of the rare earth element Ce orLa may be cerous nitrate, cerous sulfate, lanthanum nitrate or lanthanum sulfate; and the inorganic salt of ammonium may be ammonium nitrate or ammonium sulfate. The method for using the passivationsolution comprises that: the tin plate is soaked in the passivation solution for electrochemical processing, and during the processing, the cathodic current density is between 0.1 and 20A / dm<2>, the processing time is between 0.1 and 10s, and the temperature is between 30 and 65 DEG C.

Description

technical field [0001] The invention relates to an acidic metal passivation solution and a use method thereof, in particular to a chromium-free passivation solution for tin-plated steel plates and a use method thereof. Background technique [0002] Tin-plated steel sheet refers to all steel sheets coated with a tin layer on the surface, and there is a tin-iron alloy layer between the surface of the steel sheet and the tin-plated layer. The tin layer on the surface of the steel plate can be obtained by cathodic electrodeposition in a tin plating solution. The alloy layer between the steel plate and the tin layer is obtained by performing resistance reflow, induction reflow or both on the tinned steel plate. Usually the tin content of the tin coating on tin-plated steel is 0.1-16g / m 2 , the degree of tempering is T1.5~T6 and DR7~DR10(M). [0003] Tin-plated steel sheet is a metal packaging material with excellent corrosion resistance, which is widely used in the packaging o...

Claims

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Application Information

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IPC IPC(8): C25D11/00
Inventor 晏人芸黄邦霖李鹏
Owner BAOSHAN IRON & STEEL CO LTD
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