Chromizing process
阅读：298发布：2022-12-12
专利汇可以提供Chromizing process专利检索，专利查询，专利分析的服务。并且In a method of forming a corrosion resistant coating on steel strip, the strip is coated on at least one side with a uniform distribution of a chromium-containing metal powder and a considerably less amount of an alkali or alkaline earth metal halide. The powder, containing the halide, is compacted on the strip. The strip is coiled, preferably in a tight coil, and heated in a heating zone in a protective atmosphere for sufficient time and at a temperature to cause diffusion between the metal strip and metal powder, and to thus form a protective stainless steel coating on the strip.，下面是Chromizing process专利的具体信息内容。
2. A method according to claim 1 wherein the protective atmosphere is essentially a hydrogen atmosphere.
3. A method according to claim 2 wherein thE halide is an alkali metal halide.
4. A method according to claim 3 wherein the alkali metal halide is a sodium halide.
5. A method according to claim 4 wherein the sodium halide is sodium chloride.
6. A method according to claim 5 wherein chlorine gas in the amount of 0.10 to 1.0 percent by volume of the total protective atmosphere is added thereto during the heating up period.
7. A method according to claim 3 wherein the alkali metal halide is a potassium halide.
8. A method according to claim 2 wherein the powder is ferrochrome powder.
9. A method according to claim 2 wherein the powder is applied to one side of the strip.
10. A method according to claim 2 wherein the powder is applied to both sides of the strip.
11. A method according to claim 1 wherein the halide is an alkaline earth metal halide.
12. A method according to claim 11 wherein the alkaline earth metal halide is a magnesium halide.
13. A method according to claim 11 wherein the alkaline earth metal halide is a calcium halide.
14. A method of forming a stainless steel coating on steel sheet which inhibits sticking between adjacent sheet faces when heat treated in a pack of sheets, which method comprises a. applying to at least one surface of each of a series of sheets a film of a volatile adhesive liquid substance, b. applying to the filmed surface of said sheets a uniform distribution of a powder comprised of a mixture of an iron and chromium metal powder containing not less than 20 percent by weight of chromium and a halide of the group consisting of the alkali metals and alkaline earth metals in an amount between about 5 percent and 20 percent of the total metal powder commingled and blended throughout with said iron and chromium powder to form a homogenous mixture, c. compacting the said powder on said sheet by applying pressure thereto, d. placing the sheets in a pack with adjacent faces in substantial contact through intervening layers of said compacted powder, e. heating the compacted powder coated pack of sheets in a protective atmosphere for a time and at a temperature sufficient to cause diffusion between the sheets and the powder to thereby form an adherent stainless steel coating on said sheets without adhesion between said faces and opposite stainless steel coatings, and f. opening said pack without damage to the coating to reveal a smooth undamaged coating on said sheets.
15. A method according to claim 14 wherein the halide is an alkaline earth metal halide.
16. A method according to claim 15 wherein the alkaline earth halide is a magnesium halide.
17. A method according to claim 15 wherein the alkaline earth halide is a calcium halide.
18. A method according to claim 14 wherein the halide is an alkali metal halide.
19. A method according to claim 14 wherein the powder is applied to one side of the strip.
20. A method according to claim 14 wherein the powder is applied to both sides of the strip.
21. A method according to claim 14 wherein the halide is a sodium halide.
22. A method according to claim 14 wherein the halide is a potassium halide.
23. A method of preventing sticking between adjacent thin leaves of ferrous base metal in a chromizing operation wherein i. a thin film of a volatile adhesive liquid substance is applied to the surface of said leaves of base metal, ii. a powder comprised of a mixture of an iron and chromium metal powder containing not less than 20 percent by weight of chromium is applied to the surface of the leaves and compacted thereon by applied external pressure, iii. the leaves of base metal are placed in a package with adjacent faces in contact through intervening layers of compacted powder, and iv. the package of leaves of base metal is heated in a protective atmosphere for a time and at a temperature sufficient to cause diffusion between the leaves of base metal and the chromium containing powder to form an adheRent stainless steel coating upon the surfaces of the base metal leaves, comprising: a. thoroughly mixing a halide from the group consisting of the alkali metals and alkaline earth metals with the iron and chromium powder in step (ii) in an amount between 5 percent and 20 percent of the total metal powder to form a homogenous mixture prior to compacting the powder upon the surface of the base metal, and b. separating the leaves of base metal after the heating and diffusion step of (iv) without damage to the coating to reveal a smooth undamaged stainless coating on the face of the base metal leaves.
24. A method of preventing sticking between adjacent thin leaves of ferrous base metal in a chromizing operation according to claim 23 wherein the halide is a sodium halide.
25. A method of preventing sticking between adjacent thin leaves of ferrous base metal in a chromizing operation according to claim 23 wherein the halide is a potassium halide.
26. A method of preventing sticking between adjacent thin leaves of ferrous base metal in a chromizing operation according to claim 23 wherein the halide is a magnesium halide.
27. A method of preventing sticking between adjacent thin leaves of ferrous base metal in a chromizing operation according to claim 23 wherein the halide is a calcium halide.
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